The same came to him by night, and said to him, "Rabbi, we know that you are a teacher come from God, for no one can do these signs that you do, unless God is with him."

 So then belief in Jesus has these three elements--belief that God is our loving Father, belief that Jesus is the son of God and therefore tells us the truth about God and life, and unswerving and unquestioning obedience to Jesus. 