All of this sounds like an extension of Pascal’s wager. Given almost any religious idea or preference, you can say, “Well, the consequences of being wrong are so infinitely grave, that you might as well just go along with the religious idea.” For example: we can’t prove there’s a soul, but we think there is one, so abortion is murder and may lead to eternal damnation.
The problem with this is it’s binary: it works if the choice is between a specific religion and a secular position. It seems much less convincing if you accept that OTHER religions might have it right. What, for example, if the Hindus are right, and a fetus if aborted will free the soul to instantly move on to another body? Those seem like very much less serious consequences than eternal damnation.
There are also some scenarios where the secular position makes NOT aborting a very grave decision. What, for example, if a fetus is badly damaged by drug and alcohol abuse in the mother, who is also extremely poor and unfit as a parent? If there’s no soul, then it will spend maybe ten or twenty years in intense suffering, both physical and psychological, for nothing. In that case, not aborting is simply causing unnecessary suffering.