I'm not religious but I believe "deal[ing] with these thoughts" is prominent. You're going to die, so live life in a way that reflects your maker's benevolence and virtues. Be gracious and charitable with your family, your friends, and others besides, because you are all humans graced by your maker. In that way, I think religious people find meaning in their life and see death not as something to feared (ideally; qualms are understandable) but rather as the peaceful passing-on to the afterlife after a fulfilling life. Even without religion, I think people can find meaning in their lives and not fear death so much.