He has always been the Son. God's firstborn.
Begotten, (His spirit) before all ages by the Father alone. The Deity without limit, (fullness), that was pleased to live in Him was gifted not begotten.
The Son who was, His spirit, descended into the body that was prepared for Him. As we read the Father is living in Him. They are one.
He ascended to where He was BEFORE.
"Father into your hands I commit My Spirit"
So its yes and No.
Is Jesus God?
Yes, He is all that the Father is.
No, He has always been the Son.
He lives by the Father in Him and never dies.
The throne of God and the lamb forever and forever.