Many confused people identify the Pentacle with Satanism. The numerous Pagan faiths and Satanism do use the Pentacle as a symbol, however Satanism inverses the position of the symbol. This may not seem significant to a Christian; however, consider what the Nazi adoption of the Hindu Swastika did for the perception of that symbol.
More to the point, the Satanic adoption of the Pentacle is the fault of the Christians. You see, the Pentacle also was once a Christian symbol.
In the early era of Christianity, it was common practice for the Church to adopt (or ‘baptize’) Pagan symbols, so that new converts might be allowed to keep their totems, holidays, and practices as members of the new religion. For example, take the Christmas Tree (were there pines in Bethlehem?), May Day, and even Christmas Day itself (the Bible tells us that Jesus was born in the Spring, but late December celebrates the return of the Sun/Son). So too was it with the Pentacle. It was decreed by the Church that it should come to represent the five wounds of Christ.
Later, in the middle ages, many Popes began to break from the old ways, considering some certain items of Pagan origin to be unclean. The term Satanic comes from S’atan, Arabic for ‘enemy of God’. Arabic itself was considered an ‘unclean’ language, so was used to describe items and practices affiliated with what the Popes believed to be artifacts of anti-Christian sentiment. Thus ‘Satanic’, in this sense, means ‘banned from the Church’.
In this way, the Church literally handed the Pentacle off to the Satanists, who, through history, have generally held that the Church has a kernel of truth beneath the dogma of control and deciet, but have the concept of divinity backwards, and are worshiping the wrong entity. So, to put things in perspective, it is the Satanic use of the pentacle that has its roots in the ancient Pagan faiths, from which the Church adopted the symbol to begin with, not the other way around.
People, and their symbols, beliefs, and ways of worship, were assimilated into the growing Christian faith, then cut loose a few centuries later. Satanism began, among other reasons, because of this early schism. Certain ideas were cast out of the faith, and their adherents along with them. Pagan -> Christian -> Satanic.
However, it should be noted, in all fairness, that the chief difference between Satanism and Christianity today (for the most part) is that Christians believe Jesus should be worshiped, while Satanists believe that Jesus should be followed (‘You cannot walk along beside Me if you won’t rise up from your knees’). In this, Satanists could be considered more Christian than the Christians. They exhibit the traits of tolerance, forgiveness, and love for mankind – all of Jesus’s core messages. The Church, they argue, is the opposite, full of ‘unforgivable sin’ and damnation for independent thought.
Satanism is largely a return to Paganism, but filtered through the Church. Neo-Paganism, the modern Pagan movement, seeks to reclaim that which came before the Church started the whole mess to begin with.
Wicca, as a specific branch of Paganism, draws its roots from the Celtic faith. Wicca, as many know, means ‘Wise One’ in the ancient tongue, and has nothing to do with other European beliefs any more than the followers of Thor could be considered Islamic.
Wicca’s origins come from the era just after the arrival of the Christian ‘Missionaries’, who slaughtered the Celtic Druids (some say the massacre was because the Christians couldn’t win a civilized debate against them). Left without their spiritual guides, the Celts turned to the next best resource; the tribe Wise Ones, who understood many of the Druidic ways, and served as best they could. This coincides with the modern divide in Wicca: not all Wise Ones agreed on the methods and reasons for various ceremonies and holidays, which evolved into a metaphoric chasm in the root belief behind those things.
In the modern day, most Wiccans believe that each of the faith’s myriad paths all go to the same place, so to speak. The differences between invoking the Elements, the Four Winds, or even the Lords of the Fae, are superficial. The thinking is that all magick draws on the same fundamental Source, no matter what it is called, and the form of practice is merely a matter of personal preference.
So, in the end, Wicca and Satanism share one item above all in common: they are both a result of sinful acts of the Christian Church, in its refusal to embrace the Word of the one they call ‘Savior’, and exhibit the love of all mankind he was best known for. It was this ignorant intolerance that directly led to the formation of both faiths, in their modern forms, who, in the ultimate irony, now embrace those very qualities that Jesus preached, and his own Church lacks.
In the end, the greatest commonality between them isn’t the shared use of the Pentacle, but is something absolutely banned from the Christian Church: these faiths actually follow in Christ’s footsteps.