Christianity’s role is politics

As someone who identifies as a Christian and is trying to become more in line with my faith I have been thinking a lot lately about religion in politics. This has mostly been sparked by the debate of abortion in America. My view on the issue is that abortion as a form of contraception is irresponsible and deplorable. Abortion as a result of rape or safety of the mother however is more understandable but still upsetting because I do believe you are taking a human life. Anyways what I’m trying to get to is that the constitution expresses that there is a separation of church and state and I feel that banning abortion is in fact unconstitutional am I betraying my faith in thinking this.