@Aum418 said
"Another way to look at it is this way: how many people throughout history have attained without ceremonial magick? How many people attained before the large rise of ceremonial magick in the Victoria/Rennaissance era? The thousands and thousands of Hindus, Buddhists, Taoists... (it seems absurd to say none of these attained to the level of K&C of HGA which Crowley makes analogous to Union with God/Adi-Buddha, and union of Microcosm w/ Macrocosm, etc.)"
I agree with this entirely. One can go further, and say that many thousands of people have attained over a diversity of cultures and spiritual traditions without having heard of the Cup of Babalon, or the sexual Gnosis, or the Babe of the Abyss, or the City of Pyramids, etc. I don't think that Thelema can be taken out of context, which is its place in a diversity of spiritual disciplines and methods of attainment.
Staying with the Thelemic discipline for a moment, no I don't think that ceremonial magic(k) is a necessity for attaining the Knowledge and Conversation of the Holy Guardian Angel. It's one amongst a variety of methods which might facilitate the experience or level of initiation, but the most crucial factor is a state of readiness or adhikara.
There's also the further question of what we mean by ceremonial magic(k) anyway. I have rarely dressed in a robe and utilised the weapons. For me, the gestures, the invocations and more crucially the visualisations (including the corollaries across the other senses) are the essence of ritual magic.