Chalam,
I can't speak for anyone else, but I've never believed in any other god apart from the god of the Jehovah's Witnesses, when I was too young to know any different. These mainstream Christian beliefs have always looked silly to me, because I wasn't indoctrinated to believe in them. I can't just look at select scriptures from the book and see that as God speaking to me, same as you couldn't see Allah speaking to you from the words of the Koran.
OnTheWayOut,
I leave room to be wrong too. If someone ever gave me a good reason to believe in a god, I would. I can't be dishonest with myself. So far though, the 'reasons' are complete rubbish, and easily debunked. I don't need or want there to be a god, but as with everything, I try to be open. When you're unwilling to question, that's when you're trapped.
Maddie (and another poster who mentioned this, can't check right now),
For me, what happens in my social structure as a result of my changing beliefs isn't as important as believing reality. I want to be as close to reality as possible. If I was fooling myself, yet no one in my circle of friends was going to expel me, I'd still be concerned about fooling myself. I find it more important to be honest with myself than look for favour amongst others.