Well I'm not going to post a long explanation of my opinion since many of us have already discussed this here:
http://forums.emuparadise.org/showthread.php?t=39057
But one thing...
All through history people have said this same thing. It's no different now.
2000 years ago there were prostitutes, thieves, murderers, money changers in the church (which is the one thing that really pissed Jesus off) etc, etc...
I believe it's just that when we are very young we are constantly taught about God and such religious beliefs while at the same time being sheltered from what the real world is really like. As we get older we see the world for what it really is. There were just as many murders in this world when you were 3 years old...you just didn't watch the news then and parents obviously aren't going to fill their children's minds each day with such things.
It's our perceptions of the world that change, not the world itself.