There is nothing just about the idea someone as bad as Hitler, for instance, could make a deathbed conversion and go to heaven, whilst an atheist who has spent their life doing good goes to hell. That is a crazy dogma.
I know a lot of 'born again' Christians some are decent people, but some are holy on Sunday but you wouldn't trust them any further than you could throw them, if that far. I remember a church elder at the pentecostal (Elim) church I attended as a kid telling when I was a teenager exactly what he would like to do with my mother in his hay loft! The pastor of the church used to drive me back home from the weekly youth meetings; he would stoke my thigh as he drove along, telling me how beautiful my mother was! Believing in the 'once saved, always saved' nonsense is very convenient indeed!