Well, you're wrong. A value system is not a set of beliefs. I think it's important to treat people fairly. But I don't believe that the "universe" or whatever

Well, you're wrong. A value system is not a set of beliefs. I think it's important to treat people fairly. But I don't believe that the "universe" or whatever cares about fair treatment of people. What matters to me personally or what I find ethical has nothing to do with any sort of deep truth about the world. I like ice cream, that doesn't mean that I ascribe any metaphysical importance to the taste and texture of ice cream. I also don't have "deities" or anything that affects my life in a supernatural way, and I'm not sure what gave you the idea that secular people (in general) do - maybe you talked to a bunch of esoteric-minded people, or to the kind of environmentalist that turns nature into some sort of mystical deity, but that's not every secularist (nor every environmentalist). Maybe you should try talking to actual atheists instead of strawmanning them.