If someone's beliefs are based on satanism, then the person is satanic, whether they understand this is irrelevant.
Now, the Wiccans are not really Pagan in the true sense, they are Pagan-revivalists (and not very historically accurate ones at that. C.S. Lewis used to say that it might be worth having real pagans around, if only to see a government minister in a bowler and striped pants attempting to sacrifice a white bull.) But they are in my opinion on a par with the New Agers, in that their beliefs are a misch-masch of relatively harmless stuff. Of course, because their beliefs are such a grab-bag they may shade over into summoning evil spirits, working harmful magic, etc. But the religion, such as it is, is not intentionally evil.
Satanism is intentionally and unrelievedly and unremedially evil in its inception, intent, and practice. It is in effect an obscene parody of Christianity.
There are degrees of error, and I don't believe it serves any useful purpose to lump all these off the wall "religions" into the same category.
Actually, wiccans don't believe in satan, heaven, or hell. Those concepts are purely the Book inventions.