I have heard many Haitians say they do not need American Christian missionaries coming to Haiti trying to convert them to Christianity. They see VooDoo as a established and legitimate religion.
Voodoo might be a good religion. You don't have to believe in anybody. You just need a couple of real good chicken feet to shake at somebody and some needles to stick into goofy looking dolls.
So is Buddism, Hinduism, you name it -ism. Christians will continue to practice the Great Commission.
All religions have equal proof for their mystical and occult beliefs. Just because many people believe something doesn't make it true.
I don't think Scientology considers itself a religion. Many consider it a cult. I don't think you need to be a religion to be a cult.