Sorry, but the murder of unborn Americans is not a "religious" issue, any more than any other kind of murder is.
Go read the preamble to the Constitution: its very premise. It guarantees equal rights to our posterity. (Buying you a clue: "posterity" means those who are not yet born.)
Also, the idea that marriage issues are not federal ones is completely destroyed by the fact that Congress quite explicitly legislated that several states could not even enter, or stay within, the Union unless and until they forsook plural marriage.
98 U.S. 145
REYNOLDS
v.
UNITED STATES.
October Term, 1878
"...Laws are made for the government of actions, and while they cannot interfere with mere religious belief and opinions, they may with practices. Suppose one believed that human sacrifices were a necessary part of religious worship, would it be seriously contended that the civil government under which he lived could not interfere to prevent a sacrifice?...Can a man excuse his practices to the contrary because of his religious belief? [98 U.S. 145, 167] To permit this would be to make the professed doctrines of religious belief superior to the law of the land, and in effect to permit every citizen to become a law unto himself. Government could exist only in name under such circumstances."