Well, I am not sure why he said that, but simply put; there is no need for anyone to even attempt to prove anything as regards the FSM.
Why?
Because
everyone knows the FSM was
completely made-up as a parody to the Christian God/other gods -- this is beyond dispute. In fact, FSM'ers are atheists!! lol
However, the God of the Bible for example (or his supposed existence) has had tremendous influence the history of our world and societies, whereas the FSM has not.
This would make the comparison
fair in the sense that neither has been proven, but it doesn't make the comparison
equal because there is plenty of history associated with the Bible and the God of the Bible, and absolutely NONE with the FSM.
That's the reason why I laugh at the comparisons, but you all are free to keep making it, though.