Is Opposition to Abortion "Religious"?

It depends how broadly you choose to define "religious." A concern for values is what defines us as human beings. But to explore such issues as truth, beauty, justice and ethics is to enter the realm of metaphysics. There are atheists (e.g., Ayn Rand) who embrace the natural law (i.e., metaphysics) but reject the Natural Law Giver. There are "model agnostics" (e.g., Robert Anton Wilson) who reject both. I find Wilson's position more defensible than Rand's. Nevertheless, I choose to believe in both the law and the Lawgiver. It helps get me through the night.