Yah, interesting combination. & yet here you are, quoting Princeton University's Pro-life group, the exact same documents (as I recall) that we've seen before in this context. The Pro-life movement in the US is basically a Southern US Evangelical effort in the political arena, a line in the US culture wars. Interestingly, the Pro-life numbers (I believe) are mostly Roman Catholic. & certainly their theological heft comes from various papal bulls & encyclicals - in Latin, yet. A kind of appeal to authority, even though the Evangelicals as a group detest Roman Catholicism.
& Princeton started as a training ground for Protestant ministers, as I recall. Over the years & decades, it's evolved into a more secular institution; but still, the roots are there.
So, as a once Pro-life atheist, Did you have your own line of argument for opposing abortion? Or did you just borrow the logic from Pro-life organizations? Which is strange, because their arguments tend to be - given their R. Catholic membership - overwhelmingly religious, & R. Catholic brand of religious, @ that.