Myth and Ritual in Christianity

I am currently reading this book by Alan Watts. I think he has a lot of good things to say; unfortunately, a lot of this is mixed in with a bunch of garbage. He presents a good outline of Christian mythology and the importance of ritual (specifically the liturgical calendar). The problems arise with the interjections of his own opinion (which has been informed by Freudian psychoanalysis [despite his rejection of Freud] and a notion of some sort of universal mythology). For this reason he often tries to "correct" Christian mythology or read things into it that just are not there. One example of this is his insistance on the divinity of Mary. While Christianity has long accepted the mother of Jesus the human being to also be the mother of Jesus the second person of the Holy Trinity, there is no reason for this to mean that Mary herself was divine. Simply put, it is simply required by the doctrine of the Incarnation. Mary must be theotokos if she is also to bear Christ's humanity; this is simply the result of the fact that Christ has two natures (human and divine) but only one person. He also locates her divinity in the fact that from before the beginning Mary was set aside for the purpose of bringing the second person of the Trinity into time. From this, Watts assumes that Mary has eternally existed and is thus divine, either another person of the Trinity or part of the eternal Logos. I cannot find this understanding anywhere in Christian thought. If Watts wants this to be a part of Christian mythology then it must be a real part of it. If the belief never existed, and in fact never even crossed the mind of any early Christians (except as a blasphemy to be condemned), then it cannot be a part of the Christian myth. He insists that the Christian myth is part of a larger metamyth that always contains a divine Marian figure, but I just can't see the evidence for this. Anyway, hopefully more later (do I always say that?).