I know that you get on a conservative political forum to try and get those conservatives to participate in your struggle to turn the pro-life pro-marriage party into a pro-abortion, pro-gay, pro-liberal, no-God, party.
If you are against abortion, then you would be fighting to strengthen the pro-life position of the party, not end it.
A pro-life position is a legal one, not a social one. Like all of the other things you list. If you can’t oppose it on legal, rights-based grounds, you shouldn’t be fighting it.