Someone else can answer.
Exactly why is that any less desirable than any other religious practice? Nothing to do with secret societies, elites or skull and bones. Why would spiritualism and occultism be reprehensible, whereas (in Rick's logic) theism is beyond criticism?
Rick says humanity doesn't have the capacity to know everything, and this is his priniciple anti-atheist argument. If we don't know anything, then surely occultism and the "satanic zionist elites", might just as well be morally correct. Just as much as atheism, theism or agnosticism.