Yes, exactly. Just as existentialism is not a religion, nihilism is not a religion, feminism is not a religion, utilitarianism is not a religion, etc. etc. etc. All religions are belief systems, but not all belief systems are religions.
Are rites and ceremony needed to brush ones teeth or to help the elderly lady next door change her tire? Religion or religiousness does not have to be associtated with a god belief. Nor do good habits or moral behavior. Due to evolution we are herd animals that have inherited altruism, that is all that is needed.