I am one of those raised by devout rw fundamentalists who was raised in the church. I was there from 9-1 Sunday then back again at 7:30 that night. Wed. I went from 7-9 and Thurs. from 6-8. I also maintained an mostly As average at school, so doing school work and going to church were pretty much my life after school. Luckily, my folks couldn't afford a private school and the church we attended way back in the day didn't have it's own school - privatization had not gotten big back then. My life changed when I had a Social Studies teacher in 10th grade who played anti-war Joan Baez for us, taught us critical thinking, and led us in debate about the Viet Nam war. I learned so much from him and started questioning everything I'd thought I knew. Then I had another teacher in the 11th grade who didn't only praise our founders but who told us the down side as well. That summer we went to Texas and I hung out with my hippie cousin and the change was complete. I started marching in anti-war protests, participated in bra burnings, joined with friends to educate ourselves and everyone our age and draft age to find ways to avoid the draft. This was prior to the lottery.
So, anyway, with sufficient corrective input, being raised as a fundamentalist Christian can be overcome. If the person never hears the truth because the family only watches Faux and church is primary, without secular teachers, they probably will stay stuck in the mire and lies and hate.