I think it's all very complex. It is difficult to say definitively when life starts. I don't know if there is a magical point where I can say for sure where a fetus becomes a person. I probably sound strongly pro-choice, but I am actually ambivalent. I certainly don't think abortion is a positive thing, but I'd rather give women a reasonable interval in which to make a decision.
I will add that I think some people who call themselves Christians also pick and choose what parts of Christianity that they like. I am an agnostic myself. My values have been shaped by Christian parents, so I know that's part of me but I am not religious.