There is a difference between having faith in something, like Christ, and not having a religious belief. It is a common argument of the faithful to suggest that atheism is itself a religion or a "faith in science" or somesuch, but, as noted above, this isn't true, at least for most. As I said above, I don't know any rational atheist or agnostic who would not, if presented with an actual God, miracles-a-poppin', accept the reality and believe. They just don't feel it's time to prostrate when the evidence is, in their judgement, so insufficient.

Declaring yourself right and everyone else wrong is human nature, and of itself not a flaw. The actual flaw is being wrong, or more to the point, having a poor estimation of your own accuracy. A wise person only assigns extremely high confidence to conclusions when they are very well justified, and if they are truly wise, the facts bear this out. If you asked most atheists if there is a god (any god, not just the Christian one) they would say they are highly confident there is not, but if they had to give a number, it would not be 100%. Agnostics might give a number that's a bit lower but I would wager it would not be a great deal lower. If an agnostic truly want to claim they think it's 50-50 whether there is a god or not, then Pascal's wager starts to make a lot of sense since the stakes are so high, and they would no longer be agnostic.