That's why I prefer the term "blind faith." I can say that I have faith in Pray to Jesus to respond to this, and if you ask why, I could respond, "I've seen him do it before." I am presenting a (possibly...) logical backing to my belief, but it is still not necessarily going to happen.
When I subscribed to those silly religious notions, they used to have us do the "fall back check" as a way of showing what having faith in god is like. What they would do is stand you in front of someone else, and tell you to fall backward. The idea is that you know the person is behind you, but you trust them to catch you. I think based on that previous sentence, you understand where I'm going to go with this. The problem is that it is nothing like having faith in God. I know that there is someone behind me, because the person told me that there would be, and I know that the person is not duplicitous. A better example would be to nullify all of your sense, walk into a random room, choose a spot and just fall backward. In this case, you have absolutely no idea if anyone is actually there, and guess what? Chances are you're going to be leaving with a sore buttocks.
A lot of times, people like to try and prove God by simply stating that he (it?) is the answer that fulfills what we cannot understand about our universe. If there's some physics anomaly, it's not that we just don't understand it yet, it must be God!