David Grisham is a preacher for Last Frontier Evangelism, a non-profit organization based in Anchorage, Alaska, that claims to “take the gospel of Jesus Christ to the Last Frontier (Alaska).”

For the holiday season, this apparently involves telling children “the truth” about Santa Claus – that he is not real. Grisham shared a video on Facebook on December 10 of himself in a shopping mall in Amarillo, Texas, walking up and down a line of parents with their children waiting to see Santa, and telling them repeatedly that their parents are lying and that Santa is not real.

Several people come over to Grisham and tell him to be quiet, and he ultimately starts to walk away from them, after engaging one in a spirited debate over whether or not he is allowed to tell the children “the truth.”