Park Avenue Christian Scientist church is looking to cash in on Upper East Side pubescent Jews by hosting their Bar Mitzvahs. The Church is branding itself  “583 Park Ave”, which sounds like a hot venue, that is until you get there and realize the guy with the beard on the wall ain't a rabbi. But this presents a halachic quandry for those who hold it is forbidden as a Jew to even enter a Church, but what about for a mitzvah? In this case probably a top-shelf-open-bar-mitzvah….