He didn't fail. ( Matthew 3 v 17 )

Gods answer , in relation mans dreadful condition, sin,and its terrible consequences, was Jesus, his name means Saviour.We emphasise the cross and rightly so,but we must also see  the importance of His life.He had to do something the first Adam failed to do,fulfill Gods will perfectly,In  Psalm 40 v 7 - 8 and Hebrews 10 v 5 - 7 it stresses a number of things one of the things, was, to do the will of God. For His death on the cross to be effective,his life had to completely conform to the Gods will.He would have to fulfil Gods law ,in Matthew 3 v 15 He spoke of fulfilling  all righteousness, this He  did,He never deviated one bit from doings God will ,and He never sinned ( Hebrews 4 v 15 ) If  He had failed in those two things, His death on the cross would have been pointless,but praise God He didn't.