First of all this is only a moral decision if you buy into a fetus being human.
Second of all, as noted earlier, of the roughly 70% of Canadians who claim to be Christian not all are bound to a church, nor do all that are bound to a church follow all the teachings of that church.
Third of all, not all Christian churches agree 100% with your stance.
You are trying to present all who checked off "Christian" on the last census as a cohesive group, tibear. They are not.
Polls on the subject of abortion tend to show a leaning towards freedom of choice for women. I don't want to get into the "my poll is better than your poll" game, but if you look at all the polls overall and discard leading questions from both sides, you'll find that the overall trend is for women and their doctors to make the decision without the interference of the rest of us.