No, Nestorius taught that there was no union between the divine and human nature. I believe there was a union between the two. Jesus got His human nature from Mary in order to fulfill prophesy and take on the sins of man but He was also truly God. Don’t throw around names unless you know what you are talking about or don’t make accusations assuming you know what I believe.
God can have no mother or He would have had a beginning. Are you denying the existence of Jesus, the Word from all eternity?
I don't think the clause after the 'or' follows from the clause before it.