Actually, every Catholic who knows his faith would agree with this statement.
"she is NOT the mother of God."
Of course, millions of orthodox Christians over a millenium and a half would disagree. Of course God the Son, Second Person of the Trinity, is self-existent and pre-existed the creation of Mary. However, past attempts such as yours to seperate the Man, Jesus from the God, Jesus gave rise to all sorts of nasty heresies which orthodox Christians even today still reject, hence the title Mother of God. As a very wise person once stated, "You cannot know who He is, until you know who She is." Otherwise, the temptation is great to seperate the two natures of Jesus -God and Man- that are joined in One Person.
But I noticed you ignored my question. Do you agree with the Bible that Mary is the mother of your Lord? A simple yes or no will suffice.
But thrones in Heaven are not the norm - that position is reserved by God for a few.
Again, you seem a little weak on your Scripture.
Rev. 3:20,21 `Behold, I stand at the door and knock; if anyone hears My voice and opens the door, I will come in to him and will dine with him, and he with Me. 21 `He who overcomes, I will grant to him to sit down with Me on My throne, as I also overcame and sat down with My Father on His throne."
Put quite simply, we all get to sit not just on a throne, but on Jesus' throne as members of the Body of Christ. Through Holy Eucharist, we come into communion with Him and become part of Him. And you're right, this free gift is totally unmerited on our part.
"nor was she the product of a virgin birth. There are many who worship Mary, who elevate her to a position that no mortal can hold."
I know of no one or no faith that a) holds that Mary was the product of a virgin birth or b) worships her. You may want to consider the possiblity that perhaps your understanding of other faiths is a tad weaker even than your familiarity with scripture.