I’m impressed with the territory you’ve covered. The only point I might disagree with is the notion that some people might not believe in the existence of the sacred. I think they might not refer to something as sacred because of their prejudiced views towards what are commonly held to be “the sacred”. However, I believe for someone to hold nothing-as-sacred would be a nearly impossible condition.
For example, someone who “only looks out for #1” and will do anything regardless of consequence to achieve their goals, holds their goals, whatever they are, as sacred to the point of sacrificing anything and everything else to achieve them. Their kind of sacred isn’t something we would recognize as sacred but their behavior indicates what they hold sacred.