Is rey mysterio a devil worshiper?

no he isn't he is Catholic. He has a Crucifix tattooed on his chest and crosses himself when he stands on the turnbuckle during his entrance theme. Also when he was talking to Kane on the night Undertaker's "vegetative state" was announced, he said in Mexican what I assume was what Catholics call "Last Rites" or "Extreme Unction". none of these things are Christian symbols or practices.