Great question, GN!
I was practically born into Christianity (well, not really, but my parents had me in the pews the first Sunday after they adopted me), so I've never known anything different. Growing up, my parents insisted I go to Christian schools, and I always say that I probably needed the constant guardrails to keep me from flying off the handle! I was always someone who thought I wanted to rebel but hated getting in trouble, so I usually just obeyed the rules to avoid all the hassle.
I've gone through times of trying to walk away from God, but for some reason, could never do so entirely. I've known plenty of people who grew up in the church and walked away from it as soon as they got out on their own.
I always wonder if I would have ever found God if Christianity had not been so strongly imprinted on me from the beginning, or who I would be.
Most days, I'm thankful that (so far, at least), I've never had to find out.