Jan Irvin has written at least 1 book. Their most popular book is The Holy Mushroom: Evidence of Mushrooms in Judeo-Christianity: A Critical Re-Evaluation of the Schism Between John M. Allegro and R. Gordon Wasson Over the Theory on the Entheogenic Origins of Christianity Presented in the Sacred Mushroom and the Cross with 1 save with an average rating of -⭐.