Republican Debate - Abortion Mini-Rant

The Constitution clearly states that you need to separate Church and State so why are they still debating the pro-life / pro-choice issue? I’m listening to the Republican debate and these candidates want to play God. They are saying they are pro-life but will allow an abortion in cases of rape or incest, etc. That’s a contradiction. You’re telling me it’s ok to have an abortion under the terms that you deem ok? Because that sounds a lot like you are letting your church into the constitution. If you gave our young women options at a young age and didn’t just teach abstinence as a solution, you wouldn’t even have to have this debate.