You seem to be espousing a kind of Eastern mysticism that construes secular humanism as egoism (as a kind of vice or sin).

I'd turn to the special sciences which show how patterns and properties emerge in nature, including psychological and social ones. Calling the latter relatively "illusory" in the mystic's sense would be just a word game since the emergent properties are obviously real enough. Atoms don't feel pain, for instance, whereas organisms do. Is pain illusory? There's no good mystical explanation of illusions that entails we shouldn't care more about minds than, say, rocks. Respect for personhood isn't the same as sinful egoism.