As I’m sure you know, the Catholic tradition opposed abortion from very early. I believe they did so for at least two reasons: (1) it was non-procreative sex, (2) there was a danger of killing someone. Historically it wasn’t always considered murder. To the extent that that was an issue, it was tied up with the question of ensoullment, i.e. when a human received a soul. That was typically not considered to happen immediately.
But the Protestant anti-abortion movement, starting around 1980, is different. Perhaps it’s trying to stick with arguments that aren’t religious for political reasons, not ones it believes. But the main argument seems to be that a zygote is a human being from the beginning, based purely on having human DNA. This wasn’t normally the Catholic view. Indeed the modern Protestant claims seem to ignore the whole question of what beyond a bunch of cells constitutes a human being. Whether you agree with ancient ideas of the soul or not, at least the Catholic tradition understood that a human being was more than biology.
This has dangers, as any heresy does. (It’s heresy because it confuses the image of God with biology.) One is that it complicates other areas of medical ethics, such as end of life questions. Currently most people accept that when the brain is irreversibly dead, the person is dead. We’re not just a bunch of cells, but there are other requirements to be a functional human being.
Before Rowe vs Wade, abortion was often illegal, but we didn’t have quite the current doctrinaire commitment to a fertilized ovum being a full human with human rights. This is starting to lead to odd effects, such as miscarriages being treated as potential murder. After all, if a fertilized ovum is a full human being, its death deserves investigation.
It’s hard to predict what other problem are going to arise, but you can bet there will be some. An error this basic is going to have bad effects.