I mean, its possible to be against abortion for moral reasons, but morality, unlike ethics, is inextricably entangled in religion. So if they're against abortion for moral reasons, they are by definition opposed to abortion for religious reasons. Of course most Americans in my experience (and I am one) don't seem to know the definition of most words related to morality, ethics, religion, and politics, so its not that surprising. Half the country can't tell the difference between Social Democracy and Fascism, two diametrically opposed political philosophies.