I recommend
Enchantment with Tibetan Lamas in the United States by Dainel Capper, Journal of Contemporaty Religion, vol. 19, no 2 2004 for blind faith in gurus throughout Tibetan tantra
Also
The Other Side of Eden by John Steinbect IV and Nancy Steinbeck
for Trungpa/Shambhala (which is not per se a religion as it claims to be secular but in my opinion strictly a cult, though exit is not p
Forum:
"Cults," Sects, and "New Religious Movements"