When you believe the in the existence of heaven and hell, you have certain doctrines that guide you towards that belief system. Now I can say that relatively all teachings talk about something somewhat universal. They talk about the good of humanity and how doing good to yourself and others takes you to heaven. Even when you are Just spiritual, without any sort of rules to go by and you believe in the afterlife, you'll know within you that you need to do good. Even when you don't believe, it is a human inclination to do good. Whether heaven is a place or a feeling inside you, doing good wil definitely take you there. Being good is never out of style.