“Why do some Christians participate in occult practices?"
I know far too many believers who, out of ignorance, dabble in forbidden spiritual activities. Most often, these immature believers have yet to purge all remnants of occult or prohibited religious practices. Some of these things—on the surface—may appear spiritually harmless or even helpful.
In direct opposition to Christian teaching, they unwittingly consent to what God disallows. They are like those who see no conflict between having a wife and having a mistress. True marriage allows no competing lovers. Neither does true faith allow competing deities. Scripture is clear, “You shall have no other gods before me” (Ex. 20:3).
Deuteronomy 18:10-13 spells out a short list of forbidden occult activities, including (either explicitly or by implication) child sacrifice, witchcraft, fortune-telling, conjuring spell-casting, prognostication, Tarot cards, tea-leaf or water reading, astrology, sorcery, snake-charming, the casting of spells, the manipulation of spirits, necromancy, black and white magic, consulting familiar spirits, calling up the dead, séances, and channeling.
Furthermore, God forbids idolatry (Ex. 20:4), not only the worship of images but also any participation in non-Christian religions. In the name of exercise, no Christian should ever invoke Yoga's Hindu deity, “Om.” The Yin-Yang, Self-realization, Transcendental Meditation, Tai Chi, and Centering prayers of Easter religions have no place in the Christian life. Calling upon spirits, angels, or power words, for healing, is inconsistent with Christianity.
In summary, any supernatural means directed toward supernatural ends—to be sanctioned by God—must be done God's way and in accordance with God's Word. Such shall have God's blessing.
My dear, precious, beloved fellow believers—I appeal to you: “The night is far gone; the day is at hand. So then let us cast off the works of darkness and put on the armor of light. Let us walk properly as in the daytime.” (Rom 13:12-13). Why use the low and dark means that God forbids when the God of the universe is ours to call upon. He alone is more than enough!
–Pastor Scott (www.askpastorscott.com)