It is not necessary to make Jesus a "sinner" like us so that he is more human, because sin is not an ingredient that improves our condition, but degrades it. Jesus does compete against sin, not against humanity. Incarnate, the Son of God competes with sin to save humanity from suffering and death. Consequently, as long as our idea of God more resembles the man Jesus, we will be closer to knowing him and the kindness of a creation permanently put in doubt by those who want us to believe that evil is a "natural" content.