Trinitarians often complain that the reason non-trinitarians do not accept the trinity doctrine is that the word "trinity" does not appear in the Bible. Having set up this strawman argument, they then use various words that are often thought to be Biblical concepts, but which words/concepts are not actually found in the Bible.
I do not believe in adding a trinity concept to the Bible, since the Bible no where ever even suggests such a concept. The idea has to be created by thinking beyond what is written (1 Corinthians 4:6), and it has to be formulated into concepts that are no where stated in the Bible, and then those concepts have to be added to, and read into, any and every scripture that one would wish "see" those concepts. The Bible is in full harmony with itself without adding to it all the trinitarian concepts.
Additionally, the added-on "hypostatic union" concept would, in effect, justify sin in the flesh rather than condemn sin in the flesh. It would actually leave proof that a sinless man cannot obey God Almighty, except that such a man be God Almighty. -- Romans 8:3.
Finally, the concept that Jesus is still a man and that he still has the body in which he died would leave us without a redemption, since the Bible says that Jesus offered -- sacrificed -- that body of flesh to God for our sins. -- Luke 22:19; John 6:51; Hebrews 10:10.