Yes, I recommend sending the URL to the COS administration. They can take action from there.

The Sigil of Baphomet is indeed legally trademarked by the Church of Satan. You can even look it up on the US Patent and Trademark Office's website. As such, people legally can't use it without permission.
Reverend Bill M. Carnal Comedy Clips, Netherworld Novelty Numbers,
New hour every week. Download the mp3 now! Tales of Combat Clutter and other Adventures

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