The guy who played Jesus in 'Passion of the Christ' is leaning into a QAnon conspiracy theory ... which believes children are being blood-drained for a chemical in their body. Jim Caviezel made a guest appearance Friday at a right-wing convention called Clay Clark’s Health and Freedom Conference near Tulsa, OK ... where organizers griped about COVID restrictions and what they consider to the government's overreach in applying said rules. For some reason, they beamed Caviezel in through a screen ... this while addressing the issue of child trafficking (a real thing that deserves serious discussion), but which dove completely...