(1) Is Maitreya without sin? (2) Was he born of a virgin?

(1) Maitreya is totally perfected in a planetary sense. Even in a systemic sense he is without that sense of separation which we call sin. (2) No. He is a resurrected and ascended Master. In his present manifestation in the modern world (London), he is in a self-created body ― a mayavirupa.