Of course not all Christians are opposed to abortion.
However, all of these laws are being proposed and enacted by Evangelicals who call themselves “Christian” despite lacking any understanding of the messages of Jesus of Nazareth (they tend to prefer the Old Testament God of vengeance and judgement)
NONE of the anti-abortion laws are the result of secular Republicans, this is a religious movement that can pretty much be traced to Paul Weyrich (who is an extreme Catholic and a political operative who also openly advocates voter suppression).
There are sane and reasonable Christians in the world and in the United States (or at least there were just ten years ago). But one hundred percent of the political anti-abortion effort is among those who self describe as “Christian” and they are for the most part quite extreme!
Rather than pull back my assertion-- I will take it further. Not only is the Republican Party anti-abortion because of the influence of so called “Christians”, a smaller group of even nuttier extreme Evangelicals are dragging the Party to even greater extremes. I highly suggest you read the two links I provided in a different thread I posted in this morning and link below.
Ten years ago my entire world was comprised of very right leaning but decent and sincere Christians. But very nearly all of them have drank deep and hard from the FOX News Koolaid and have developed stands not only antithetical to Orthodox Christian principles (in the sense of traditional-as opposed to Heterodox; not in the sense of run by a Bishop and dating back to the disciples), but down right opposite to established Christian principles.
Examples would include a US Congress woman claiming if Jesus had an AR-15, He would have never had to be crucified (despite that being the central tenet of the faith on which all other theologies are built). Another is the revisionist history that makes America (The United States) a Christian Nation - not a secular one. And a thousand others, some discussed in the links above.