I know I am responding to a real old response by Sheryl, but I just had to post this video. It entails a segment on brain scans of an atheist and of a religious brain. Very interesting!
I'd say it has made you, at least partly, the way you are; if you are talking about being brought up religious.
I was but didn't accept my now-dropped church until I was in my late teens. I would say that prior to that I was much more gregarious and out-going; my church made me introverted and anti-social. that was a definite alteration of who I was. I am slowly working my way out of it but I guess for you I would need some specific examples of how you would say religion altered you to understand what you mean.