" For there is not a just man upon the earth, that doeth good, and sinneth not." (Eccl 7:20) Many people consider themselves to be " a good person"; they have never killed anyone, never robbed a bank, never been to jail. They consider their "vices" to be a part of their lifestyle. They go to work, pay their taxes, and in a pinch call out to "the man upstairs" to help them out. If you told them that they are on their way to Hell, they wouldn't believe you. 

We are sent to proclaim the gospel to every creature! Jesus said, "He that believeth and is baptized shall be saved: but he that believeth not shall be damned" (Mark 16:16 KJV). Every disciple of Jesus Christ is commissioned to share the gospel with those who do not know Jesus Christ as their personal Lord and Savior.