Another term for this heresy is "indifferentism". It's easily proved to be heresy. First proof is that if any religion/worship is fine and all are fine, then the lack of worship is equally valid. Second proof is all the religions that it includes, such as the worship of Baal or the ancient American worship of Huitzilopochtli and other blood thirsty gods that demanded a constant stream of human sacrifice, which is objectively evil.
