I am the Way, the Truth, and the Life. No one comes to the Father except through me.
We have a hard time believing that Jesus is all that we need. I think we struggle with it because it seems too simple. Due to the way that we manage our human relationships, we expect there to be religious hoops for us to jump through. We are looking for rigorous tests of endurance, physical challenges, and intellectual acrobatics that will determine our worthiness. We are all conditioned for the survival of the fittest.
In His supremely counter cultural way, "simple" describes exactly how God set up this relationship for us. It's a matter of us accepting what He offers and choosing to commit our lives to following Him. Through our pride and ignorance we add layers of complication that don't exist. For us, it actually takes more faith to grasp this gift of freedom than it does to believe in a complicated system of moralistic behavior modification.