Yeah, Christianity has evolved but mainly because there are so many sects. If the Catholic Church was still the only branch then I think we might still be very conservative. Muslims are at that stage...like the Catholic Church was before the reformation.
But then again, it seems like some branches of Christianity are sliding backwards. Maybe even trying to match Muslims for who has the best faith. Look at the kooks out of Topeka, Ks., the Catholic Bishops with birth control, evangelicals with everything conservative.