On the one hand, you're right, but on the other hand, what you're describing is essentially just religion. Believing in spells is little different than believing in prayer. The "astral plane" may as well be Heaven or Hell, or Purgatory. The Bible is an "occult" text about demons, containing spells and rituals, and
many people believe in a literal God and Devil and intercession by angelic and demonic forces.
And of course there are plenty of schizophrenics who claim to hear the voice of God and claim to be doing His will, something which might have gotten one canonized centuries ago, but no one pathologizes Christianity when that happens. If we're going to consider magical thinking normal in one sense, we should consider it normal in every sense, because the only difference between "religious" and "occult" practice is cultural acceptance.
Or else accept that all of it is equally ridiculous, that Aleister Crowley is no more divine or absurd than the Pope.