I'm gaining the impression that Zen is a sort of meld between pantheism and existentialism, the former as explained in
ZEN by Osho as immediate experience in contact and participation by the individual in the Big Picture
Though call your attention to some misgivings about Zen, represented ion
http://able2know.org/topic/201808-1
With
IRRATIONAL MAN, A Study in Existential Philosophy by William Barrett I see a mixed comparison. The similarity consists in a rejection of conventional religion and a reliance on Intuition
However where Barrett's view paints a most gloomy essence, that of Osho and crew is jolly and filled with laughter
Though I hasten to assure I'm no intellectual by any means, slogging through the two tomes in a jerk entirely to occupy the period between commercials (pun intended)
So what's your take, no hands barred