On ChabadTalk, there is a discussion going on regarding the authorship of the prayer Nishmas Kol Chai, which is recited on Shabbos mornings. The general consensus of the posters in that thread seems to be that Shimon ben Shetach wrote the prayer.
However, it seems that there is an old Christian legend that the prayer was written by Paul (Saul) of Tarsus. That legend is discussed in the thread as well.
During the course of the conversation, someone made the following comment about Paul:
I have also heard it said that this Saul/Paul was actually sent by Chazal on a mission to make Yushkie-worship a completely different religion so that it could not be confused with Judaism.
I highly doubt that that legend is true. However, there just seems to be something very ironic about such a statement coming up on a Chabad message board. I wonder how long before some of the anti-Yechis believe the same thing about some of the Meshichists.