Satanists basically believe in the same god as christians do right?
That really depends on the specific Satanists you're talking about. A few sects aren't even theistic at all. I mix them up sometimes, but I think TST was one of the humanist non-supernationalistic ones.
Are you sure there is such a thing? My understanding was that they just submit their sandwich transactions to the mempool with higher and lower gas respectively to achieve their desired priority ranking. Could be wrong though.