Why Crowley’s Tarot in particular? Well, you can tell fortunes with ordinary playing cards too—no one is stopping you. But the Great Work should be undertaken with the tools best suited to it.
The most popular deck, Waite’s Tarot, is heavily Christianized in its imagery. In the twenty-first century, it makes little sense to rely on Christianity alone.
Tarot embodies certain archetypes in our consciousness, yet these archetypes change with the succession of ages, or Aeons. New images and principles of thought leave their imprint. That is why seriously working with Waite’s deck is simply a waste of time.
We have other views and ideas. Christian dogmatism interests only a handful of outsiders today. Even “Christians,” in my opinion, can no longer grasp the depth of Waite’s imagery. Its time has passed: Waite’s Tarot appeared at the close of an Aeon and was already outdated then, let alone now!
Today, Waite’s Tarot can only be studied from the perspective of the history of esotericism.
Crowley’s Tarot, on the other hand, is thoroughly modern in its imagery. It is not bound to religions, and it has depth.