But there can be justice: "Can't Get Any Simpler" is a "3 min read" here in Medium with links to more articles about a materially based approach to justice, one that has no beliefs, secular or sacral. (For the benefit of 'guest readers': nothing I publish here is behind the paywall.)

All moralities, God-based or not, sacral or secular (such as, say, Confucius's or Immanuel Kant's) are based on beliefs (immaterial truths).