According to Osho, Christian mysticism and Zen are incommensurable: the former pursues personal union with a projected God, a hallucination born of belief, while Zen realizes shunyata, pure nothingness beyond mind and language. Because mind can project deities but not nothingness, their foundations diverge utterly. Genuine awakening requires dropping all concepts (God, heaven, hell), emptying thought until mind ceases; only then is the Zen experience possible.
Christian mystics imagine meeting God; Zen lets go of every idea until only quiet nothingness remains, so they aren’t the same.