"Are there any religious or whole congregations that use mushrooms during service?" You might be interested in reading about María Sabina,[1] who introduced Go

"Are there any religious or whole congregations that use mushrooms during service?" You might be interested in reading about María Sabina,[1] who introduced Gordon Wasson (and, through him the whole rest of the world) to the magic mushroom. [1] - https://en.wikipedia.org/wiki/Maria_Sabina https://en.wikipedia.org/wiki/Maria_Sabina