So, which is it? When Mary gave birth to Jesus was He only human or was he Human and God?
You are confusing yourself!
Christ’s Godness was never born; it is eternal. You’re trying to get something eternal to be born, and that is fallacy.
The only thing that was born was his blood attachment to those he would save, and that was how the price was paid for all of us, including his mother, and his half-brothers and half sisters.