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I sometimes would debate that with Jehovah's Witness and Priests.

I'd say something like this...
"Jesus saw the pharisees and said God id not in there"
referring to their temples and attacked their practices
"God is in you"
and from the stories seems to have held gatherings outside frequently...

What happens when he is dead? (assuming he actually existed) The people go back to doing what the Pharisees were doing.

EDIT: And me with my loathing of hypocrisy... that shoves me right into the deep end and I go nuts. ;)