It is impossible for an eternal being to be born; it is a contradiction in terms. God used Mary as a tool to bring Himself into the earth in human form.
And Mary said: "My soul exalts the Lord, And my spirit has rejoiced in God my Savior. "For He has had regard for the humble state of His slave; For behold, from this time on all generations will count me blessed. – Luke 1:46-48
**Mary’s own words and the whole of Scripture nullify any biblical basis concerning notion of an immaculate conception and nullifies the notion of a sinless life. **
**The Scripture also nullifies the perpetual virginity unless Joseph’s and Mary’s other children were adopted, which there is no indication of this and every indication of the words of the writers of the NT, including Jesus own words, is that Joesph and Mary waited to engage in sexual relations after the birth of Jesus as a God ordained and blessed family would be. If she did not have physical relations with her husband, then God is the God of contradiction because ordained marriage and part of that covenant relationship is the gift of sexual relation and the result of that is clearly represented by the fact that they had other children besides Jesus. Anyone who holds onto these types of contradictory traditions from men, in my opinion, cannot believe what the Bible says in this regard. **
Take it for what it is; you either chose to believe the Biblical accounts or you chose not to; it really is that simple according to Mary’s own words. Perhaps this is why the original poster appears to question these dogmas.
This is all I have to contribute concerning this topic, which is rather cut and dry.