Best kind of trolling for these threads is the elaborate kind.
Make it a paragraph, explain your moral outrage in a comprehensible way. Drop allusions to religion (never explicitly mention it), and so on.... Basically just explain why the hypothetical you while trolling finds it distasteful.
Also good to add something on to the end like:
"Say you and your girlfriend had a child, would you want her sexualized in this way?"
See that double entendre trolling there?