I could add, based on a few decades of life as an adult, that almost all of the abortion I've known of was motivated by concerns of inconvenience, chief among that including the economics and time requirements of child raising. It's a very thorny issue that ironically provokes anti-abortion activists to killing others, though this is rare.
And then I can't resist thinking about Kierkegaard, who pointed out that our anxiety about our behavior with respect to Christian morality is what keeps churches from turning into dance halls (and since your essay deals with extrapolation, maybe brothels or equivalent?)
So if infanticide, whether in the womb, or after birth, is already mostly a convenience issue, there isn't much Christian morality there at all. But is it pagan? What kind of paganism? There is a huge menu to choose from among billions of non-Christians.
If my thinking, writing this, seems unclear or objectionable, fine. Yours is a well written, thought provoking essay that clearly draws upon thoughtfulness and life experiences. But maybe I am way too overanalytical and want to put "paganism" in a box with clear boundaries. Are there any?