My own interest in mummer's play's is long gone, but I'm following this in admiration of the sheer scholarship of the participants. What may also may be interesting is the evolution of the value of originality, for the old sense of which some writers did actually invent antique fictional antecedents to give credibilty to their own inventions. But originality as a value later came to mean the opposite. If people do invent an origin, sometimes, pagan or whatever, perhaps it's to gain a gloss of the former idea of Originality, to stress a timeless interest and to relegate say, particular religious values to a secondary role. But there may also exist an opposite desire to stress uniqueness in particular connection with a cultural or religious value. Reminds me of the patterns of likenesses in Hamlet, where sometimes the differences matter more to some than others.