Why can't we simply borrow what is useful to us from Buddhism, Hinduism, Taoism, especially Zen, as we borrow from Christianity, science, American Indian traditions and world literature in general, including philosophy, and let the rest go hang? Borrow what we need but rely principally upon our own senses, common sense and daily living experience.
The use of drugs like mescaline may serve an appropriate purpose. Indeed, "Psychedelic" drugs have been widely used in the spiritual traditions of the world, including the Yoga of Patanjali, though they were never advertised as ultimate keys to enlightenment, merely as stepping-stones on the spiritual path.