I have to ask...are you serious? Then I read this section over again and have to ask....are you talking about Jesus being born to the Father in heaven...pre-incarnate .....or are you referring to Jesus being born on earth via Mary?
I also have to ask, by "Jesus has His own spirit" do you mean as part of His incarnation He received a spirt just as we do?
You asked:
Jesus is the firstborn of all creation. Before the angels of God. Before the world began. As a Son he has His own Spirit before the world began before all other beings except God. The Son that was (His Spirit) was in the tent of the body God prepared for Him as Mary conceived by the Holy Spirit. The Father was still in Him with His Spirit. Just as Jesus is in us as the Spirit was sent in His name.
Jesus=>"Father into your hands I commit My Spirit"
Hebrews 1:6
And again, when God brings the firstborn into the world, he says, "Let all God's angels bow to him."
hebrews 12:23
...the assembly (church) of the firstborn...
So what I state is Jesus has always been the Son and He has a beginning but no end.
Randy