I don't know whether it's new or not, but the thought tickles my fancy. A novel argument is hard to come by these days because the ancients have stolen all of our ideas! Here is what Rauser said:
John Loftus just came up with a new argument against Christianity. He summarized it like this:My argument asks What Would Happen if Christians Went on Strike?
1) If Christianity is true then the Christian faith will probably not die out if Christians stop proselytizing.
(2) The Christian faith will probably die out if Christians stop proselytizing.
(3) Therefore Christianity is [probably] false.
It is, if nothing else, a novel argument. Link