Pinpointing the actual moment when we turned to Jesus is not really important. The Bible tells us that the second step in deciding to follow Jesus is faith. Faith means abandoning all trust in one's own resources and casting oneself unconditionally on God - particularly on his promised mercy for all who seek it. It means relying completely on Jesus - on the sureness of his promises and the wisdom of his commands. Faith in Jesus particularly focuses on his sacrificial death and resurrection on our behalf.
Faith is an act of trust at conversion and an attitude of trust throughout life.
It is, in simple terms, a firmness or resting on the promises of God - a resting on his Word. First and foremost faith is a response to Jesus' saving work on the cross and the empty tomb. Faith is the attitude of abandoning all reliance on our own efforts of gaining salvation by good and religious works, rather it is the attitude of completely trusting Jesus alone for our salvation. Such a faith is a conviction that the Jesus of the Bible is true. Faith is dependence on the person of Jesus.