Roscoe, you are leaving "artificial birth control" out of your calculations.
According to a recent full-page ad campaign against Planned Parenthood, most of the baby victims of abortion are hispanic and black. 75% of Planned Parenthood centers -- the main place to get abortions in the US -- are located near minority populations on purpose.
Apparently whites tend to use more artificial birth control -- their sin comes "earlier in the chain". Not that no whites have abortions -- we're talking big picture and overall statistics here.
We know a lot of white Protestants (old college friends, etc.) who are married with no kids. Can we assume that most of them are using artificial birth control, considering that it's completely accepted and recommended by modern society? It only seems reasonable to assume so.
So that would reduce the number of abortions -- even if it's replacing an evil with another evil.
No matter -- in either case, God is not mocked. Both birth control and abortion have horrible side-effects which will be felt in their relationship, health, psychological health, etc.
Matthew