Alyssa Grenfell's video "How Freemasonry Became a Mormon Cult Ritual" argues Joseph Smith adapted Masonic ceremonies — secret handshakes, code words, and penalties — into LDS temple ordinances. The video, which has drawn 44,804 views in eight hours, traces the timeline: Smith became a Freemason in March 1842 and introduced the endowment ceremony seven weeks later.

Greenfell, an ex-Mormon author and YouTuber, presents the parallels as evidence of plagiarism rather than divine revelation. The video examines specific elements of both ceremonies, including symbolic gestures and oath language. Temple ordinances remain among the most sacred and private aspects of Latter-day Saint worship; the Church teaches they were revealed by God, while critics point to the Masonic timing and similarities as Grenfell does here.