True Christians will not attend because they know to allow a demon based teacher in a House of the LORD is apostasy.
True Jews will not attend because they believe Christians are following one who practices apostasy. (I say ‘practices’ because Jesus is ALIVE!)
Muslims of all stripes will be okay with this as they are instructed to mix with Non-believers and then to kill them.
The mosque will have rocket launchers on the roof pointed at the synagogue.