You claim to be a Trinitarian but you haven't the foggiest idea of what you are saying. There are THREE Persons in God: Father, Son and Holy Spirit. They have ONE nature: Divine. You cannot subdivide God's nature in the manner you wish or that you believe. If you pray to the Holy Spirit, for example, you pray to God--the Divine!
This explains the nature of the Creed of Nicea and those later which categorized Christian Trinitarian belief. Where did this come from? From Jesus, largely, in the Gospel of John in which He reveals this unfathomable secret to us. If it were not for Christ, we would not know these amazing facts.
The Trinity is the deepest Mystery of Christian Faith. You have doubtless heard the story of Saint Augustine pondering the Trinity and finding a child trying to empty the sea into a hole in the sand using a sea shell. The Bishop asked the child what he is doing and the boy tells him that he is emptying the sea into the hole. The saint responds that this is impossible. The child responds that he will empty the sea into the hole before Augustine ever comprehends the Trinity.
There is a nice book that deals largely with the Trinity called "Theology and Sanity" written by Frank Sheed (the real Sheed from whom I derive my name). You would be well advised to read it or one similar. You are very confused on this fundamental point of Christianity.
Jesus Christ is God. Of that I am sure beyond any doubt. And Mary was the mother of Jesus the Christ, the Logos, the Word....the mother of God.
Thank you. I guess my explanation was a bit on the brief side. :)