Popular misconception. From what I understand at some points they would make recruits practice what to do if they were captured by the Muslims and forced to convert. Baphomet is a corruption of Muhammad. The Templars believed that captured Christians would be forced to worship Muhammad so they'd make their recruits pretend to convert and do a bunch of other hazing. Well, rumors got out and people came to believe, or pretended they believed, that the Templars were secretly worshipping an idol called Baphomet. It was used as evidence against them in their trial when the King of I think France decided to liquidate them so he could clear his debts and steal all their money.