It is very dangerous. I agree-it does open one's self up to demonic spirits both for the one practicing it and for the one it is against. The Blood of Jesus is one's protection from the curses brought against them by such practices and also for the one is who practicing this by choice, so if one is practicing this unknowingly to the seriousness of it, the answer is to avoid it entirely. It's not just a prank or something of a nonchalent matter. It is withchcraft and demonic and can carry heavy consequences and truly, whether one wants to believe this or not..the covering of the blood of Jesus is the only protection from such consequences, Not trying to scare anyone, just a warning. Things of this nature are spoken of in the Bible or I may never have known.
Demons can cause things to happen. Not only is Voodoo a religion that is incompatible with Christianity, but its practices and beliefs are against God's Word. Moreover, the occult practices of Voodoo are dangerous because they open people up for the influence of demons.By blending polytheistic spirit worship with a superficial form of Christianity, Voodoo has effectively denied the primacy of Jesus Christ and His atoning work on the cross and the need for redemption solely through faith in Christ. Voodoo, therefore, is incompatible with God's Word in three ways: the true God is not worshiped, Jesus is secondary to the spirits, and occult practices prevail. Stay away from it completely.