We need faith to believe there is a God, that he is good, that he loves us and desires to save us from our wrongs. We need faith to peep from under the despair of defeat and accept loving mercy and start afresh in a new life each day. We need faith to believe God has power to change us and overcome our sin.
Faith is based on hearing the word of God usually first spoken by God's people around us and seeing it lived by them. It is based on the most excellent God the Father, Son and Holy Spirit.