If Jesus was to sin then all the bible and theology which speaks of Him is totally false and useless. Upon further investigation we would come to realize that His death on the cross was totally worthless and unacceptable. So where does that leave us? "..for it is the blood which makes atonement"- Lev:17:11. Since we have no sacrifice of animals any longer (and no temple in which to partake in the sacrifice) then we all shall die in sin. All our faith, our hope, and our salvation rests on this 1 simple fact: Jesus, the Christ, was sinless. And that His sacrifice was accepted on our behalf.
