2 Manly P. Hall – known for writings on esoteric philosophy.

That picture is actually of Gerald Gardner, the guy who founded (kind of? Its complicated) the religion of Wicca.

To answer the question though, white Jesus easily has the most toxic fan club, by sheer volume of followers.

Anton LaVey was an edgy fuck though, so he probably gets 2nd place for just being kinda cringe ¯_(ツ)_/¯