My Crowley background is pretty spotty, but I read that as him generalizing over ethical intersections with religious experience and then specializing to his own faith. It's not entirely unlike some posts I've read here, in fact; the implication seems to be that if some consequence of your religious (i.e. axiomatic; we could substitute decision-theoretic or similarly fundamental) ethics seems to suggest gross violations of common ethics, then it's more likely that you've got the wrong axioms or forgot to carry the one somewhere than that you need to run out and (e.g.) destroy all humans. Which is very much what I'd expect from a rationalist analysis of the topic.