John Nelson Darby of the Plymouth Brethren in England 'invented' the doctrine of Dispensational Premillennialism.

Aleister Crowley's father was a Plymouth Brethren minister and Crowley grew up steeped in 'end times' eschatological banter that was completely unbiblical.

Aleister Crowley's mother's worst fear was that she may have begotten the Beast of Revelation 666 and the Antichrist who would hold power over all the nations. Her fears and delusions regarding this matter were the driving forces behind Crowley cracking up at a young age and pursuing a life long quest to be the Beast 666.

And it all started with the unbiblical falsehood of Darby's 'Rapture' doctrine.

The entirety of Crowley's body of writing may be seen as one, long extended sick, twisted joke against his mother's delusions.