Jehovah's Witnesses teach Jesus was created and he's "a god" according to John 1:1 in their NWT. Yet the Bible teaches all men are sinners?

Since all men are sinners according to some of the following verses, why do other verses teach that Jesus Christ was sinless? > Behold, I was brought forth in iniquity, and in sin my mother conceived me. > > Psalm 51:5 > Indeed, there is not a righteousness man on earth who does good and who never sins. > > Ecclesiastes 7:20, > For all have sinned and fall short of the glory of God." > > Romans 3:23 Other verses would include, Jeremiah 17:9, Romans 5:12, Romans 6:23. On the other hand, the following verses identify Jesus Christ as sinless. > He/God made Him who knew no sin to be sin on our behalf, that we might become the righteousness of God in Him. > > 2 Corinthians 5:21 > Who committed no sin, nor was any deceit found in His mouth. > > Hebrews 4:15, > For we do not have a high priest who cannot sympathize with our weaknesses, but one who has been tempted in all things as we are, yet without sin." > > 1 John 3:5. So, how do the Jehovah's Witnesses reconcile this apparent/seemingly contradiction?