Angels are not human. You do not die and become an angel. No more than a duck dies and becomes a robin.
The battles in heaven were between the arch angels, (mike and his crew) and Satan’s gang.
We are just different species...so to speak.
Where did you hear that?
We were create in the image of God.
That means we are the children of God just like he said.
We are the same species.
There are other scriptural references to pre-mortal life.