Simple. I’ll take myself, for example. I am personally anti-abortion. I think it is a sin. But I recognize that this is my personal belief. I am also pro-choice. I recognize that other religions (and non-religious people) have their own beliefs that are different from mine. And I have no right to impose my personal religious beliefs on them. So I am pro-choice–in other words, I am in favor of every woman having the right to decide what to do based on her own beliefs and her own conscience.
Please don’t sidetrack the discussion by arguing about this. What I wrote above is a fact; if you think it’s contradictory, go ahead. If you disagree, that’s your right. But what is NOT your right is to say “Everyone else thinks exactly the same way I do.” They don’t. Trust me.