I became an agnostic because, from my perspective, there isn't enough evidence to prove whether there is a God or Higher Powers or not. I think atheism is based more on belief rather then empirical evidence and science, though much evidence would concur that there isn't a God.
Alright, shoot.
I think the question is completely upside down. I think that you have presented a premise, and want somebody to argue against it. That is not how it works. Let's say for instance that you grew up never having heard about a god or religion, and then somebody asks you why you don't believe in one. What are you to say? I'd happily believe in a diety, if you were to present any form of evidence for one.
"there isn't enough evidence".?. there is no evidence. I find it interesting that when this question is asked it always refers to the Jewish god Yaweh, never to the Roman gods or the Greek gods. Of course that would be silly wouldn't it. Of course we know they don't exist.
Questions like this show that earlier indoctrination has residual effects.