It’s already on the topics list, but been sitting there a while. It is on there, though!
I don’t deal with religious girls all that often, but I suspect I’d handle that one the same way anything else – go by feel. If she’s clearly turned on: “Well how about this… think God would like this?” [escalating].
If she’s not turned on, there’s a good chance she’s just throwing whatever objection she can at you to get you to back off (and get her more aroused first), and that one just happened to be near at hand.