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