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Zac Brown haters are hell-bent on convincing people his show's Satanic ... but, the Church of Satan's telling people to slow their roll -- because they know what the Devil's rituals really look like!

Here's the deal ... the singer-songwriter played The Sphere in Las Vegas last weekend, and his set was accompanied by some images that sent the righteous souls on social media clutching their crucifixes. Instagram / @spherevegas

One image rising over the stage was a skeleton with a huge jagged crown towering high above everything ... its mouth open in a macabre smile as the Zac Brown Band tore up the stage.

The visuals had concerned onlookers screaming "demonic" ... even claiming it was all part of some Satanic ritual ... so, we went to the ultimate authority on the topic -- The

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