Although many people from many religions attend, SteemFest is not a place for worshipping or praying religion or promoting a religion on stage IMHO.

Exactly.

Satan literally mean "the adversary". On that, they have been good at challenge all systems of power, good or not. There is a different between what satanist say they are and what they actually do. I'm in the unfortunate position to know what they do beyond the glossy varnish they give themselves.

Seriously, would Google I/O or F8 consider giving a podium to the SATANIC TEMPLE. Just on the PR front it's horrible.