God's Holy Spirit is the presence of God, where did I deny this? So is Jesus. To be near Christ is to be near God. Jesus is the Father's Son as the Spirit is the Father's Spirit. They proceed from the Father.
That isn't a bad argument.
Matthew 28:19
Go, therefore, 12 and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit,
That isn't a bad verse. It's as valid as any other verse from the Bible.
Ah, don't come with all that paganism stuff. That must mean a dying and ressurecting Jesus is a borrowed concept too, right? Prophecy would say otherwise.
The Catholic Bible has a strong prophecy in it for Christ, where it's stated that this just one boasts that God is His Father, and that He's the Son of God.
http://www.nccbuscc.org/nab/bible/wisdom/wisdom2.htm
So prophecy can overcome even the biggest pagan claims, hope it works that way. I don't even know how the Trinity is a pagan idea.