Nazarenus, or, Jewish, gentile, and Mahometan Christianity : containing the history of the antient Gospel of Barnabas, and the modern Gospel of the Mahometans, attributed to the same apostle : this last Gospel being now first made known among Christians : also, the original plan of Christianity occasionally explain'd in the history of the Nazarens, wherby diverse controversies about this divine (but highly perverted) institution may be happily terminated : with the relation of an Irish manuscript of the four Gospels, as likewise a summary of the antient Irish Christianity, and the reality of the Keldees (an order of lay-religious) against the two last Bishops of Worcester