:::: I think "renunciate" in this context just refers to asceticism and austerities, although I would welcome input on that. Regarding the other points, "secretive" probably is somewhat judgmental, and I agree probably doesn't merit inclusion in the first sentence. Describing the group as an ascetic/austerities type might, and I could see, maybe, not knowing the subject that well, possibly including millenarian in the lead sentence, if the group has a very profound view regarding the immanent end of the world, which I haven't been able to check myself yet.