One always get back to the main issue "who or what is Jesus the Christ". God Himself called Him "Son" ("this is my beloved Son in whom I am well pleased") He stated "God and I are One", No-one comes to the father but by Me", and the real kicker "And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was." So, He and God are in some way One, yet He refers to God as Father and God refers to Him as Son. They both had a relationship before the world was made. Unitarianism does not explain any of this in a rational manner, and therefore must be false.