If I have learned one thing it is that if you have one hundred pagans in a room you will find one hundred differing opinions as to what paganism represents for each of them. However, few in my experience, particularly few of the leaders, actually subscribe to an external supernatural reality. After discussion with many I have found that they are attributing "power" to the human mind and deities to their minds' perception of a reflection in nature. Only a small number of often unhinged individuals within paganism actually believe that gods, godesses, demi-gods, demons etc exist outside the mind's projection of their perception.
Witches and Satanists both consider themselves to be pagan. You only have to go to the writings of LaVey, Aquino, or indeed Crowley to discover that much. However, they also tend to pour scorn on witchcraft and view its as a mere training exercise for the erstwhile uninitiated; though Crowley claimed to also be a witch. Ordo Astrum Serpentis, ostensibly a "witchcraft coven" during the 1980s, used basic witchcraft as a training period for new members. It was actually a satanic cult, as each of its ex-members would later testify. (See From Satan To Christ by Sean Manchester). John Pope, self-proclaimed successor to Aleister Crowley, has latterly claimed to be an initiate of witchcraft; though he once ran the United Temples of Satan. David Farrant, jailed for necromantic diabolism in Highgate Cemetery and posting death dolls with menacing messages, has always claimed to be a "high priest of witchcraft." Alex Sanders, responsible for the pagan/wiccan revival in the UK, following the post-war repeal of the Witchcraft Act, never denied his own dabbling in what he himself described as black magic. I do not have to lump witches, pagans and Satanists together. A significant number are already doing a good enough job of that all by themselves.
The problem is that a pagan can, more or less, write their own rules. A Christian cannot. He or she is constrained by the teachings of Christ and the tenets of the New Testament.
Quicksilver talks about rudeness, whilst referring all the time to "Xtians" and "Xianity" (instead of Christians and Christianity) as though the name "Christ" is so anathema as to be unmentionable. This is rudeness personified in my book.