diabolist

In Lovecraft’s classic 1926 story The Call of Cthulhu, for example, the Elder Gods from outside space and time are remembered and venerated by “Esquimau diabolists and mongrel Louisianans” — by non-white people, in other words.

The detestation that any rational soul spontaneously feels for the Yankees is so innocent, so uncontaminated by spite — just instinctive revulsion before something obscene, like the goat-headed god of the diabolists.

The pair are drawn into a secret underworld populated by demons and diabolists, and only Evadne’s skills as a fencer can save them.

Mr. Spurgeon and the "diabolists" concede the whole of the spiritualistic position.

The superstition is in the person who admits there can be devils but denies there can be diabolists.