Because it's in your party's platform.Seeing that Christian women get abortions the most in this country, why is this issue consistently blamed on the Atheists and Liberals?
Identifying with a certain religious group doesn't mean the individual is religious. Take Obama for example. He identifies as a Christian, but he supports abortion and homosexuality, and he lies and breaks the law on a regular basis. I'm sure there are many women out there just like him.