I really don't want to try to convince anyone of a particular position, so I hesitate to "debate" the point. In fact in my personal belief system it is of no real importance to me. In my own opinion it seems to simply be a way of trying to explain a Monotheism
with three God figures. Personally I don't believe this criticism is valid and thus needs no defending, thus no trinity.

I usually won't use Bible verse to make a point, but in this case in might be appropriate.

"For there is one God, and one mediator between God and men, the man Christ Jesus" - 1Timothy 2:5


"No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father." - Mark 13:32

"You heard me say, 'I am going away and I am coming back to you.' If you loved me, you would be glad that I am going to the Father, for the Father is greater than I." - John 14:28

"Jesus said to him, 'Away from me, Satan! For it is written: "Worship the Lord your God, and serve him only." - Matthew 4:10

"Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent." - John 17:3

"Jesus said, "Do not hold on to me, for I have not yet ascended to the Father. Go instead to my brothers and tell them, 'I am ascending to my Father and your Father, to my God and your God.'" - John 20:17

There are literally dozens more....again, the only reason for this belief (IMO) is to defend against Christainity being accused of polytheism.