The religious objection to existentialism doesn’t take much explanation: Sartre completely denies the presence of any omnipotent God that watches over us or judges our actions. To Sartre, we’re born out of nothingness—poof!—and then it’s entirely up to us what we are and do, and then we die—poof!—and that’s it. Nothing “guides” us, we’re not following any playbook from religion or spirituality or anything. All we have, and all we ultimately are, is the choices we make while we’re alive.