His "shadow" concept as promoting sin: Jung’s notion of integrating the "shadow"—the dark, repressed aspects of the psyche—frames it as a path to wholeness. Yet this clashes with Christian teaching, which calls for the rejection of sin, not its acceptance (Romans 6:12). By urging individuals to embrace rather than repent of their baser impulses, Jung’s theory risks normalizing moral corruption, undermining the transformative power of grace.

Alchemy and Gnosticism as heretical: Jung’s fascination with alchemy and Gnosticism veers into theological quicksand. These esoteric traditions, steeped in pagan mysticism, prioritize secret knowledge and self-divinization over submission to God. Orthodox Christianity has long branded such ideas as heretical—echoing warnings in 1 Timothy 4:1 against doctrines of demons—yet Jung elevates them as legitimate spiritual pursuits, defying the exclusivity of biblical revelation.

False path to salvation: Jung peddles a seductive counterfeit: salvation through self-transformation via mystical practices and psychological alchemy. This sidesteps the core Christian claim that redemption comes solely through Christ (John 14:6). By positioning the individual as their own savior, Jung’s framework not only dilutes the Gospel but offers a hollow substitute, luring seekers away from true reconciliation with God.

(http://www.autoadmit.com/thread.php?thread_id=5696738&forum_id=2#48763500)