Consulting the the Merriam-Webster Online Dictionary and the Concise Oxford Dictionary, I looked up the word faith and teased out eleven different meanings, or shades of meaning:
1. Complete trust
2. Reliance or trust in
3. Belief founded on authority
4. Allegiance to duty or a person--loyalty
5. Fidelity to one's promises
6. Sincerity or honesty of intentions
7. Firm belief in something for which there is no proof
8. Something that is believed especially with strong conviction
9. Belief and trust in and loyalty to God
10. Belief in the traditional doctrines of a religion
11. A strong conviction in a system of religious beliefs
Of these, only the last three specifically deal with religion, although three of the the others may be construed as having significance to religious faith.
1. Complete trust
2. Reliance or trust in
The first and second meaning represent a faith in someone of something, an unquestioning belief in the good intentions and competence of a person, or in the reliability of an object, process, or idea. This belief is nearly always based upon previous experience, where that person or thing was proven to be trustworthy in the past, so it is not initially assumed without question. This attitude is accepted only when the relevant questions have been resolved to our satisfaction. It does, however, include a risk; even the most reliable person may prove to be wrong at one point or another. Anything or anyone can fail. In the event of failure, our trust may be shaken. Nevertheless, to avoid the need to do everything ourselves (something which is simply not possible), and to avoid the paralysis or despair of radical doubt, we must at times assume this attitude in the delegation of tasks to others or in reliance on objects or methods.
Furthermore, a more general attitude of faith is required, one which is even less subject to prior verification of character--in short, a true leap. This is our faith in democratic process, which is itself based upon a trust in the people to behave and vote responsibly. The loss of such faith encourages fascism, an attempt to impose upon an unruly and ignorant mob moral codes which the authorities do not trust them to follow without enforcement. Contempt is the dominant attitude of the dictator towards his people. Support for fascism begins with cries of widespread moral turpitude amongst the population. Democracy is based upon a faith in the people, which would-be dictators seek to undermine in their bid for power.
3. Belief founded on authority
The third meaning is a special case of these. Although skeptics loathe blind faith in authority, there is such a thing as informed faith in authority. This is made a necessity by specialization. The last Rennaisance men died off four hundred years ago; since then it has been impossible for anyone to know everything of consequence in all fields of knowledge, and so we are forced to rely on second hand knowledge. We then make a survey of the field (superficial, unless we are ourselves specialists,) and select those whose authority we accept on the subject. If we fail to identify these authorities properly, we are left rudderless and prone to exploitation by pseudo-experts, or may even fall into the inverted authoritarianism of the conspiracy theorist, who will dispute the opinions of a recognized authority precisely because she is an authority.
4. Allegiance to duty or a person--loyalty
5. Fidelity to one's promises
6. Sincerity or honesty of intentions
The next three are the reciprocal of the first three meanings: to be faithful to and to act in good faith. Here is the moral dimension of honesty and integrity. These are the assumptions upon which the faith in a person are based: we assume that they are being honest and will carry through on their intentions. Since these support our faith in others, and that faith is necessary, misconduct in this area will disrupt the economic and social fabric. The complete breakdown of these practices will lead to a condition of total competition, the war of all against all. These attitudes must be predominant to make civilization possible.
7. Firm belief in something for which there is no proof
The seventh, a firm belief in something for which there is no proof, is usually despised even by those who hold religion in high regard; most believers claim to have some sort of proof for their beliefs, however precarious it becomes under inspection. Skeptics, of course, decry this as the root of all folly. There are, however, circumstances in which such faith is indispensible, and that is in the anticipation of future outcomes. This especially relates to the first three meanings, because our faith in others concerns, not what we know they have done, but what we expect them to do or expect them to have done but don't yet know. I cannot be certain that whatever I buy will work, that friends will not disclose secrets, that my bank will give me back my money, or that my employer will pay me. It may well be quite likely, but I cannot claim that it is certain before the fact. That I rely upon these outcomes is a show of faith, and more generally, it reflects an attitude of optimism. The absence of such faith, again, leads to paralysis and despair.
8. Something that is believed especially with strong conviction
Nearly everyone believes something with a strong conviction. Most would simply say that they know it to be true, but in nearly all cases, there remains a margin of error, however small. Yet at some point, we simply have to accept a proposition given sufficient evidence. There are some people who fall prey to the absolutist-relativist fallacy, that even the slightest possibility of doubt lowers the chance of truth to being no more than half, rendering the proposition a matter of mere opinion. Ultimately this comes down to a lack of faith in evidence and sound reasoning itself; there are people who simply withhold emotional or judgemental assent from the weight of evidence. Studies of patients with damage to certain areas of their frontal lobes have revealed that even sound reasoning and knowledge of the facts may carry no impetus to sound judgement if no emotional weight is given to these factors. These patients suffer from a debilitating incapacity to manage their lives.
9. Belief and trust in and loyalty to God
10. Belief in the traditional doctrines of a religion
11. A strong conviction in a system of religious beliefs
The last three deal with the religious meaning of the word, and have come to be regarded as the core definition of faith. This is the meaning of the word employed with believers who defend faith and atheists who have no use for it. But this meaning is markedly different from the others. First, it is the only type of faith which is entirely divorced from evidence. Indeed, while we would regard as imprudent any other kind of faith in the absence of some supporting evidence, believers consider faith in God all the more virtuous when there is no evidence. Secondly, this is the only form of faith which we can do without. All others serve as a bridge between certainty and some measure of uncertainty, without which we would be unable to get on with our lives. Most atheists seem to get on very well without any religious beliefs. Atheism itself is not a religion, but the simple absence of religion.
In the struggle over this narrow meaning of the word, the other meanings have fallen by the wayside. This is a problem of framing: defining the terms of an argument to force important concessions from the other side before the discussion even begins. Extremist believers have insisted upon this narrow definition, exploiting the positive connotations of the word while disregarding its positive meanings. By accepting this narrow definition, secularists have conceded most of the playing field. This is quite unfortunate, because most secularists are democratic and left-leaning. The values supported by the first eight definitions are the very values they hold most dear. Religionists have made taboo a word that secularists need to be able to use without embarrasment.
This is not mere semantics. The non-religious form of faith includes trust, loyalty, optimism, hope, charity, honesty, an antidote to fear, and even forgiveness. There is no other word for this attitude that fits so well, and renouncing the word leaves a hole in the discussion. Faith in this general sense is not mere belief in a specific proposition, but an attitude. A belief in an all-powerful benevolent God will tend to support this attitude, provided that one also believes that this benevolence permeates all of reality, and that people are, for the most part, good. Indeed, you do find religious people who hold this belief. The consequence of this belief, however, is not ardent proselityzation or harsh judgementalism--these people will hardly mention their faith unless you ask them about it. For them, there is no need to fight because the war has already been won. Atheists don't mind these people; they're not broken, so they don't need fixing, and they don't try to impose their beliefs on others. Extremist believers, however, have no use for them: you cannot control someone who is not afraid. You cannot save someone who isn't fallen. You cannot teach someone to fear a God who intends no harm. Religion, and belief in God, are not the problem. The problem is the political exploitation of these beliefs.
For the fanatic, faith in God or the Messianic figure must preclude faith in everything else. Years ago I came across a curious heading in a Catholic Magazine: "On Golden Pond is a Pornographic Film." The author was outraged that the film found any meaning, solace, or happiness in human life without constant reference to God. He was convinced that since the characters in the film did not live an overtly religious life, every single moment of their lives should have been portrayed as incessant misery and meaninglessness. Like a savvy advertising executive, he realized that to sell his product, he had to create a need, and the surest way to create that need is to encourage a profound sense of inadequacy. Faith in humanity is not to be tolerated. But if humanity is polluted, fallen, worthless, then there is little point in hope or charity. They cannot be trusted, so freedoms need to be restricted for the people's own good. They always do the wrong thing, so suffering is just their lot, richly deserved. And if you do happen to be prospering, it could only be due to divine favour. Christianity, the religion of charity and forgiveness, has been subverted to become the religion of greed and judgement. In God we trust; all others pay cash. It is no accident that the nation that claims to be the most Christian, the United States, has the highest rate of incarceration, violence, child poverty, and the highest disparity between poor and rich in the first world. Christianity has been stripped of faith and reduced to rote belief in a supernatural agency. This is what comes of a lack of faith in humanity.
Furthermore, the desperation and harshness of the fanatic is not based even upon the most narrow religious definition of faith. If God really is in control, why does he need your help? The fanatic acts, not out of a conviction in the power of his religion, but because he believes the faith is weak and threatened. He is determined to impose his views because he lacks faith in the judgement of others; his totalitarian ambition is symptomatic, not of a deep faith, but of a nagging doubt in the power of his deity. That the fanatic refuses to acknowledge this doubt is no refutation of its existence. The fanatic is obsessed with the Enemy, which may be a supernatural power like Satan, or a competing world view like secular humanism. It is their profound belief in the power of the Enemy, not in the power of God, which drives them to take up arms. They have the trappings of faith, but no understanding of it.
The best thing that we can do would be to take the word faith away from these people. They don't have it, don't practice it, don't even really believe in it. They fear doubt because they are riddled with it but will not admit it. We need to take faith away from them, and leave them to content themselves with mere superstition. Because, really, this is all they have.