Wealthy Killers - on Abortion

I today read an argument against abortion by a Christian doctor. He called doctors "wealthy killers" of "silently screaming" babies.
It made me think. First, I remember the strongest argument in the area of abortion which I heard during college philosophy classes. A woman said that abortion would be wrong so long as we lived in a society filled with people who could afford to adopt children as an alternative. So, views against abortion would be weaker in a weaker economy. Second, I remember that religion is strongest when an economy is poorest.
So, speaking from a mathematical perspective, religion is inversely proportional to economic health. The strength of pro lifers, a religion-motivated movement, should also be inversely proportional to economic health. I know, it makes my head hurt too.
My extrapolation is thus: So long as America is rich, Christianity will not have the pull it wants, but abortions will remain relatively uncommon. If the economy falters, Christianity would strengthen, but not without limits. There would be a breaking point, after which abortion would become a good idea, especially in the absence of birth control which some sects oppose.