Yeah, that exact sermon there by nullc was both deeply wrong and insulting to me.
Honestly, it's nothing more than someone trying to disparage Luke because of his faith. I don't care how far up the right you are on the bell curve... Ad hom is ad hom and that one was particularly gross.
And to your point, I think whatever argument he was trying to make there was secondary. An afterthought to the insult.. And it's hard to imagine he really thought it through.