When we're conditioned to fear something it can be difficult to get our subconscious to accept something even though we've consciously decided there is nothing to fear. That's why we can come to the conclusion that something is not worth fearing but still have an instinctual fear towards it. The way to overcome that is to confront that fear and basically condition your brain not to be afraid. Just consciously remind yourself when you feel that fear that it's not rational and that hell cannot exist. Even do some research into the arguments as to why hell isn't real and have conversations with others about how there is no reason to fear hell. After confronting your fear for enough time, that instinctual fear you feel should go away.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell
