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Revelation 22:14-15 Blessed [are] they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city. For without [are] dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.
People are so blinded to the fact that these things are a form of idol worship. Chants for earthly purposes is a form of worship. Satan wants people to think it is just fun and games, or that it is just a sports thing, or something like that. People are too smart to bow down to Satan directly or give him worship, but when any expression of worship is taken away from God and given elsewhere, it is idol worship.