Philosophy leading to Atheism

Why is it that most people who start thinking and getting into philosophy become atheists?

When we study philosophy we try to find a reason, proof and a cause for faith in god. Faith cannot be verified. Nobody has seen god, then how can any one say if he exists yet so many people believe in God.

Now the original question: why do we deviate from god. Well its not that we deviate from it suddenly but we realize the ways that others around us follow to look attain God or heaven seem totally irrational. For e.g. god does not want us to give him materialistic gifts, have fasts, pray in the way we do etc. For e.g. say a different civilization which believes in a notion that to please god we should have sex. It may sound absurd but a civilization can have such a tradition. For one it is less gruesome than human or animal sacrifices.

The deviation from these methods causes other people to label philosophical questioner as un-believer. He is not an unbeliever. He is at this point agnostic, or looking to just verify what he has believed till now. In some cases depending upon the people around our subject he may turn atheist or remain agnostic. Now when he questions again and again in the matters of faith he may be ostracized and it may result him to loathe the idea of religion altogether. This is one and the most likely way how one may turn atheist.

It is difficult for one to realize that something he believed in all along has such a weak foundation. It is like being in love. It cannot be quantified. It can only be felt. For e.g. If you are in love and some one asks you to prove it you can't. It is true about god.

Now you will ask if these methods are irrational then why do such methods exist, people are smart. Here I would say we humans have a tendency to believe in whatever is super natural very easily. People tend to believe in something that seems unbelievable.

The way I see it that at some point of time the notion of religion was brought up to bring order to the civilizations in particular. It is just a theory though. The religious leaders must have define some standards so that people will not engage in small crimes the like theft etc. Because when the idea of religion originated the society was not as civilized as it is today but that is off course deviating from the point.