That is total bull. I can give you a reading list that disproves this.
This is part of the smear campaign initiated by the French King to justify his murder of them.
The prison in which they were held and tortured in, then killed still stands.
So too the graffiti that the knights carved into the walls, hundreds of them.
No severed heads, no Arabian magical signs.
Crosses, Crucifixes, short prayers to God, and a few depictions of the tree of life.
"Sufi Freemason exercises incorporating sounds, gestures and the mystical letters found at the beginnings of certain chapters in the Quran, all intended to perfect the soul. Wahdat-al-wujûd Arabian concept of the Alchemical Unity of Being, the perfecting of the Individual, the creation of the Philosopher's Stone. Through the doors of the Crusades and the Templars Arabic Majiq / Mysticism became known to Europe and the West. 'The' Knights Templars became influenced by the spiritual wisdom of the Moorish Sufis. Sufi alchemy is one of personal transformation, not forced by visualizations or overt intentions but rather through using the body as an alchemical instrument."
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Secret Practices of the Sufi Freemasons by Stephen E. Flowers, Ph.D.
"Modern scholars agree that the name of Baphomet was an Old French corruption of the name Muhammad, with the interpretation being that some of the Templars, through their long military occupation of the Outremer, had begun incorporating Islamic ideas into their belief system, and that this was seen and documented by the Inquisitors as heresy."
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Barber, Malcolm - The New Knighthood: A History of the Order of the Temple
"The indictment (acte d'accusation) published by the court of Rome set forth ... "that in all the provinces they had idols, that is to say, heads, some of which had three faces, others but one; sometimes, it was a human skull ... That in their assemblies, and especially in their grand chapters, they worshipped the idol as a god, as their saviour, saying that this head could save them, that it bestowed on the order all its wealth, made the trees flower, and the plants of the earth to sprout forth."
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Haag, Michael (2009). Templars: History and Myth: From Solomon's temple to the Freemasons.
Abu el-Atahiyya (748-c. 828), was a respected writer and mystic writer. His disciples were called Wise Ones and adopted a Goat as their Tribal symbol. The goat had a torch between the horns – which incidentally later became a symbol for the devil in Spain. The torch simply represented illumination and wisdom, that the Tribe (Goat) was the Head of Wisdom. When Freemasons traveling in the Moorish lands encountered Sufis, the mystics of Islam, they soon recognized a common bond. “Sufi-ism,” said Sir Richard Burton, was “the Eastern parent of Freemasonry.” John Porter Brown, an American diplomat in Turkey in the mid-1800s, was a Freemason who wrote sympathetically of the Sufi path. In The Darvishes, he admits finding it “rather strange that the Dervishes of the Bektashi Order consider themselves quite the same as the Freemasons, and are disposed to fraternize with them.” Brown commented on how in Turkey Freemasonry had come to be generally regarded as “atheism of the most condemnable character.” A position not unlike the one held by Papus, the celebrated French occultist and Gnostic bishop, who tried to counter the Masonic lodges which, he believed, were in the service of British imperialism and the international financial syndicates. Papus also viewed Freemasonry as a diabolical perversion of the ancient secret tradition and atheistic at heart.
Baphomet is a representative of the “Universal Principle”, the “Azoth” or “Fifth Element” which to alchemists is the key to turning lead into gold, coupled with the fact that the idol was often depicted as a goat with male and female sexual organs, might cause one to think that the Templars had somehow stumbled upon and absorbed the tenets of the cult of the she-goat Amalthea. Baphomet’s name literally means “wisdom” in Aramaic, if run through the ancient Atbash cipher that was often used by the Templars. The result is “Sophia”, which was the name used for the goddess of wisdom, who was often revered in Gnostic cults in New Testament times. It was believed in these cults that one could unite spiritually with Sophia by performing certain rites and meditations, and thus one could obtain “gnosis”, or divine knowledge.
Gnosticism was widely practiced in the Roman Empire during Christ’s time. One man widely believed to have been a Gnostic was John the Baptist, the prophet of the New Testament who announced the coming of Christ. John was, after his death, himself revered by a number of Gnostic cults. There were even, by medieval times, numerous underground “Christian” sects called “Johannites”, who believed that John was the true Messiah. Johannite cults even exist today in the form of semi-Islamic Gnostic sects found in Iraq.
During their time in the Middle East, the Templars had established and maintained contact with mystic sects belonging to different religions and denominations, including sorcerers. They were known to have close links to the hashashis (assassins) who, while influential, were regarded as a perverted sect by the Muslim population. From them, the Templars had learned some mystic teachings and barbaric strategies, as well as how to organize a sect. As will be seen in the coming chapters, the order's higher echelons, in particular, had also acquainted themselves with and incorporated into their practice—beliefs based on the mystic teachings of the Cabala, the influence of the Bogomils, and Luciferians, thus leaving Christianity behind. According to the Templars, Jesus was a god ruling in another world, with little or no power in our present one. Satan was the lord of this material world of ours.