Good point that the government was for Godly people.
I have always voted Republican because of my stance against abortion. I voted for Trump the last two times for this reason. But I have come to see abortion as more of a political tool for the GOP than anything that will ever change, and this is because while the government was for a Godly people our politics have become ungodly and designed for the interest of one's party.
There is no chance the GOP will ever stop abortions or even make abortion illegal. And they know it. The best they could do is something that will never be done - a repeal of Roe vs Wade. But even if Roe vs Wade is reversed, all that will happen is it will fall back onto states to make abortion laws. Reversing Roe vs Wade would not make abortion illegal, it would just create the possibility a few states may ban it within their borders.
So the GOP has been using abortion as a narrative to gain votes. Realizing this, it seems that the best position for the Christian to take against abortion is not the GOP but the Church and reaching out to give those women the gospel of Jesus Christ, helping them to see another way and an option for the child, if poverty is the issue help open up a way for the mother and child to live, if other issues are present help find a way to save the child (perhaps adoption), and if abortion is performed continue to show the woman the love of Christ.