To simply believe that Jesus is Lord or is the Son of God is not sufficient to gain salvation. There are thousands or maybe millions of people in church (and not in church) who profess to be Christians bound for heaven simply on the basis that they believe.
Have You Studied the ABCs?
The knowledge of sin in a biblical sense comes from a personal encounter with the word, or the Word, of God. Thus the first step in repentance is not sorrow for sin, but revelation – a decision made, not by man, but by God.