The Trinity is a good place to start.
I believe the following about the Trinity (from the Creed in the Episcopal Book of Common Prayer):
“We believe in one God, the Father, the Almighty, maker of heaven and earth, of all that is, seen and unseen.”
“We believe in one Lord, Jesus Christ, the only Son of God, eternally begotten of the Father, God from God, Light from Light, true God from true God, begotten, not made, of one Being with the Father. Through him all things were made.
“We believe in the Holy Spirit, the Lord, the giver of life, who proceeds from the Father and the Son. With the Father and the Son he is worshiped and glorified. He has spoken through the Prophets.”
I further believe that our Lord, Jesus Christ, true God from true God, of one Being with the Father, came down from heaven by the power of the Holy Spirit, became incarnate from the Virgin Mary, and was made man.
In other words, God came down from heaven and was made man from the Virgin Mary.
The Father was not made man. The Holy Spirit was not made man yet proceeds from the Son and the Father. It was only the Son that was made man.
It is true that Mary is not called the “Mother of God” anywhere in Scripture. It is also true that the Triune Godhead, God the Father, the Son, and the Holy Spirit, has no mother. But if the Son is willing to come down from heaven and be born of woman, it seems that He would also be willing to consider that woman to be His mother while He was on earth. For this reason only can Mary be called the mother of God.
So you believe in one God yet part of that God died on the cross and another part of that God raised the part of God that died from the dead? Have I got the right?