Good post. But before you hang your hats on the various writings of the early church fathers, consider that John related Christ’s assessment of the early Churches in the first 3 chapters of Revelation. Even by 90 A.D. a LOT of heresy had crept into the churches. They were already pulling the stunts we pull today.
Also note that in the world around them, child sacrifice was incorporated into a lot of “accepted” religions. This practice would have been so repugnant that explicit instructions regarding abortion would have hardly been necessary.
Good points.