Most people who are at all religious believe that invariably they are or will be saved. Most are under a fairly strong conviction that they know God and are known by Him, that God understands them and how much they have suffered on this earth and how much they have tried to be a good person by doing their best to lead a decent life, obey Him and attend church etc. They draw a certain comfort and security from their good intentions. They believe that God knows their heart and because of this they feel confident that He will not cast them into Hell. Just as most people never think they will end up a murder victim or die by shark attack so, too, most are convinced that they could never actually be one of those people who end up in hell. But people do get murdered, they do get taken by sharks and real people do go to Hell.