There are many good books that prove his existance and I'm not just talking about the bible. Although most people don't suffer from that problem because the main problem which people have is that they choose not to beleive. This is known as unbeleif.

From any Philosophy course you will learn that people will make up rules by agree(ing) on a certain ideas. For example, the only reason why you can read this text is because you have associated this group of words with a meaning. We all agree that a chair is something you can sit on and this word 'chair' gives you that idea. One is allowed to beleive 'chair' exist or not hence it is one's own choice. What if someone foreign to where you lived didn't beleive in a chair. What would you do to try and convince them that chairs exist? Even after showing them a picture, and demonstrating what it does, the foreign person decides that such a idea does not exist.

This example shows that things can exist wheather one beleieves in them or not. If one didn't know the law and got caught breaking the law they would be punished in some way. The justification is that ignorance of the law is no excuse. So why do people want to take chances on their future?

That is not uncommon and you may not notice that you use faith everyday. One beleives that the next day will seem similar to the last day on faith. One beleieves that the sun will come up tomorrow which is similar to the last example. Although, in those examples on can actually see those things. So.. lets take the idea that one has a brain in their head. Yes, even after seeing that other people have brains in their heads, one cannot actually say that they have seen their own. One usually takes that idea that they have a brain in their head on faith.

Thus showing that one uses faith all the time and that it isn't as hard as you think to beleieve in something.