If there are objections on the soul level, you should still expect to see a hierarchy based on preventing/allowing fertilization per birth control.

For example: Going by pure number of 'abortions' (counting as any termination of a fertilized ovum), there is a continuum for birth control. IIRC it's pill -> patch -> condoms -> spermicide+condoms -> shot -> implant -> IUD -> surgery. Implants and especially IUDs cause up to an order of magnitude fewer of these 'instant abortions' compared to the pill.

We should expect to see pro-life campaigns saying "get an IUD, NOT the pill!" (Or supporting vasectomy / tubal ligation, but fat chance on those.) But again, we don't see that. Because those 99.9% effective things will lead to sin.