In the UK there is 'Practicing and Practising'. This clarifies the differences more. I always remember this a 'Practice with a C for Clinic, as in Doctor's'.

I think you are getting confused between 'To do or perform (something) repeatedly in order to acquire or polish a skill' and 'To carry out in action'.

There is no such thing as either a 'practicing' or 'practising' Satanist.

I completely agree. There's enough confusion in my life with all the things I have going on right now. I'm not going to add to all this if I don't have to.

Quote:

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A Satanist whose hobby or fetish is Satanism per se, is no more of a Satanist than one who, realizing the indulgence advocated by Satanism, accepts the Name. The difference between the man or woman who’s a practicing Satanist, from an identity Satanist is that the practicing Satanist looks at the picture, while the identity Satanist studies the frame.

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--Dr Anton Szandor LaVey
The World's Most Powerful Religion

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Perhaps this is what self described "practicing" Satanists are referring to.