I think you mean “unholy pact with Evil.” But given that he dined with Judas who was filled by Satan to betray his Lord, I guess he dined with a “Satanist.”

And I completely agree that there are Satanists in this world. But the point is that it is not up to you to decide who can be saved and who cannot be saved. Christ saved the thief on the cross. He can save anyone, even a Satanist.