Not all branches of Christianity forbid abortion. The Catholic Chuch has always forbidden it, of course, but evangelicals and fundies didn't used to get up in arms about it. It was a non-issue when I was growing up in a fundie household, just something that was never talked about.
I never even heard the word "abortion" until I read an article about Sherri Finkbine (https://en.wikipedia.org/wiki/Sherri_Chessen) in Life Magazine, and I had to ask my mom what the word meant. I think I was 14 at the time. She replied very matter of factly; my mom was as fundie as it gets, but she didn't have any strong feelings about abortion one way or the other.
Meanwhile, Catholic kids were already getting the whole "abortion = murdering babies" indoctrination. It wasn't until some time after Roe that the fundies and evangelicals starting jumping on that bandwagon. I guess making it legal was what set them off. As long as it was a clandestine thing that nobody talked about, they just sort of ignored it.
And even now, as rabidly anti abortion as some Christian denominations have become, there are others that still regard it as a personal matter and don't make a big deal of it. Outlawing abortion is definitely in opposition to the religious beliefs to that segment of Christianity. It would be interesting to see that tested in the courts.
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