From the Wikipedia article:

"Early chiropractors believed that all disease was caused by interruptions in the flow of innate intelligence, a vitalistic nervous energy or life force that represented God's presence in man; chiropractic leaders often invoked religious imagery and moral traditions. D. D. Palmer said he 'received chiropractic from the other world'. D. D. and B. J. [Palmer] both seriously considered declaring chiropractic a religion, which might have provided legal protection under the U.S. constitution, but decided against it partly to avoid confusion with Christian Science."*

Why would a chiropractor tell you that? Nobody selling you a quack remedy is going to just come out and tell you it's quack remedy. That's rule #1 of selling quack remedies. But the history of chiropractics isn't a secret, Neither are the statistics on vertebral artery dissection and other injuries caused by chiropractic adjustments. But look, I'm not your mommy. You don't have to believe me, and you're free to go do what you feel. It's your own neck you're risking.