The divinity of Jesus of Nazareth inheres in his being one of the three persons of the Trinity, the Godhead, and not in any sense on whether or not his mortal mother bore additional children. He is God, and nothing that any mortal has done or can do can alter that truth. No Christian believes that Messiah did not exist prior to his incarnation in a manner chosen by God to serve His purposes, or that God could not have achieved His purpose by some other means. We presume too much when we undertake to impose conditions on Jesus’ divinity on the basis of the imaginings of our innately sinful and errant minds.
You raise good points. Are you aware that cells from a gestated child remain alive in the uterine tissue of the mother for possibly the rest of her life? If one believes Jesus was man AND God in His flesh, then cells from his time in Mary’s womb would also be ‘cells from God’. Would it be profane to have other children conceived in such a place? ... I’m asking, not preaching.