Romney's position isn't unusual - it's the position of someone who opposes abortion but has not deeply considered it. It's also the position of someone who does understand it but is a coward. I will let others decide which one Romney is.
But let's not forget two things.
1. Banning abortion but allowing exceptions for rape and incest would ban 95% of all abortions. That's certainly better than 1.2 million murders per year.
2. Barack Obama is so deranged that he actually supports infanticide. He voted against banning it. That's not the position of a Christian, and Obama is not a Christian. He worships the demon Molech.