No one believes in abortion. He believes in a woman's right to decide over her own body and the embryo is a part of that. He also knows that women's mental health is better when it's legal when it's...
He's Christian.
He says that he is a Christian, and he sometimes attends Christian services. But only he and God know the answer for sure.
No. Obama is a rational thinker.
It could be either. "Pres" is an abbreviation for "President." Although you should probably use a period at the end of "Pres." like shown.