Forgive me if this was mentioned, but I would like to interject some information that might be relevant. From what I know, evangelicals believe in the hell of fire and brimstone. I would like to mention, however, that Judaism, from which Christianity is derived, there is no hell in the Christian sense. In Judaism, Gehenna is more about atonement for sins and facing the shame and guilt of all the sins you committed in your life in order to cleanse yourself in preparation for receiving your eternal body in the new kingdom. It is a temporal punishment, meaning, except for a few rare cases, the punishment is not eternal.
But as has been mentioned, avoidance of the Christian hell is an effective recruiting tool. If the soul exists and is immortal, who wouldn't want to avoid eternal punishment.