For the last 18 months or so, a new organization has been tabling on the sidewalk in San Francisco’s Castro District, distributing wisdom to passers-by. Called the Church of Cosmic Consciousness, its gospel deals with an increasingly common path to spiritual growth: so-called magic mushrooms. The church recently rented a brick-and-mortar on the corner of 18th and Ord streets, a few blocks uphill from rainbow flag-filled Castro Street. It’s a bit different from the Bay Area’s other mushroom churches. The firmly established Zide Door, with locations in East Oakland and SoMa, is ambitious in scope and guarded by fearsome security....