That's just how I see the satire at play.

FSM tries the 'rationalist' approach to religion whilst IPU is based entirely on unquestioning faith.

"Deaths in the Bible. God - 2,270,365
not including the victims of Noah's flood, Sodom and Gomorrah, or the
many plagues, famines, fiery serpents, etc because no specific numbers
were given. Satan - 10."