There’s no argument there. He quotes Jesus acknowledging that He is a separate person from the Father, but that’s the entire point of the Trinity. How then is the Trinity debunked? That Jesus is God is fully established in scripture, so if Jesus is God and also a separate person, then what option is there other than the Trinity?
http://christianthinktank.com/cw4hx.html#iam
I suppose you could argue that the Holy Spirit is a manifestation of Christ or the Father and maybe argue your way down to two distinct persons, and some may argue that Jesus wasn’t a distinct person until God “split” Himself at the incarnation but the Bible doesn’t speak to that. All we know is that now, post-incarnation there are at least two and probably three persons in God.
**That Jesus is God is fully established in scripture, so if Jesus is God and also a separate person, then what option is there other than the Trinity?**
Jesus Christ is the image of the invisible God, not God the image. Jesus Christ and the apostles/writers of the NT NEVER used the phrase, “God the Son”.
The Father is not an image, but a Spirit (Jn 4:23,24).
In Jn 12:44-50, Jesus does a wonderful job of explaining things. Also 14:11.