As a Christian is it usual to doubt religion as a whole in the mid teen years?

Yep. When I finally thought about that it changed my whole perspective on religion. After a lot of thought I finally came to the conclusion that I'm an atheist. I'm a teenager and I haven't necessarily given up on religion entirely...I'm still studying. Not just Christianity, but other religions too...But for now, I think it's just best to say that there are no gods. I mean, we were born not believing in any, right?