So? The scriptures don't instruct Christians to go out and spew forth profanities at Satanists or even satan. As a matter of fact such behavior is portrayed in a very negative light...
Likewise also these dreamers defile the flesh, reject authority, and speak evil of dignitaries. 9 Yet Michael the archangel, in contending with the devil, when he disputed about the body of Moses, dared not bring against him a reviling accusation, but said, “The Lord rebuke you!” 10 But these speak evil of whatever they do not know; and whatever they know naturally, like brute beasts, in these things they corrupt themselves. 11 Woe to them! For they have gone in the way of Cain, have run greedily in the error of Balaam for profit, and perished in the rebellion of Korah. Jude 1:8-11