An atheist for instance might come on this thread and say that Christ was just a man and God is an illusion of hope, a "pink unicorn" (one of terms they are wont to use.) He could make such a claim, and I would expect the posters here to make mincemeat of it without making it personal.
He said that Christianity worshiped the Devil for 2 millennia.
That's unacceptable. He deserves no courtesy-pings.