I believe that in some Protestant sects it would be, on the grounds of it being crypto-Popery. Hmm. ‘Popepourri?’
PS: I leave the question of where the children of Adam and Eve – particularly Cain – got their spouses to actual Bible literalists, as it is a question relevant to their worldview, not mine. Besides, one gets the impression that the primary motivation for many people of asking said question is more or less “I feel like being a schmuck today.”
*She’s not asking it. Merely passing along the chuckle.