lol.... He was high on god apparently (Aiwass to be precise) - if you look at his natal chart and the transits at the time he wrote it.... it's pretty incredible the energies that were coming his way, including the imfamous "Saturn Return". Basically, he is foreseeing the shift from matriarchal, pagan, earth centered religions to patriarchal ones (based on sacrifice) to the New Aeon (as featured in the Aeon card) based on the son of the Mother and Father. He's not really unique in his representation of the first two (god the mother, god the father), but speculation around the 3rd - god the child - is very rare.
It is highly recommended you find a copy in which Crowley elucidates the text of LL. He has a pretty good grasp on the first section, explains it well. The 2nd one, he has a general idea. The third book however, he seems to have no clue what he was channeling and takes a great deal of the verses literally (as instructions for rituals). The best version is the 1970s one published by Llewellyn - newer copies are "edited" I have heard.