If you didn't need faith to believe that a fetus is a human deserving of life, you wouldn't support other people in the right to commit murder on a helpless innocent. If you really knew it to be true, you'd call for lethal injection for abortion doctors. But people apply a different set of rules to make-believe, in which they don't have to act like it's really true; in exchange everybody gets the right to pretend all of their different make-believes. That's a very benevolent system and I like living in a country that does that. However, I personally try to avoid faith beliefs in order to not have beliefs that I apply that set of rules to. That way, when I see an injustice that I care about, I can always act to try to stop it. When I know something, it's through evidence that I can present to other people; so then I present it as evidence for it to be made into the law of the land.