If your absolute is not religion but the universe itself, then that is called Objectivism (Ayn Rand's philosophy).
This is incorrect. Moral absolutes do not come from religion, they flow directly from God Himself -they are PERSONAL in nature and come from a PERSON. The universe is a non-entity (not alive) and it is non-rational in the extreme to believe that morals can come from a non-entity. You might as well say that morals come from a tree! Ayn Rand's philosophy comes from HERSELF and it is relativistic (relative to HER).
Yes, they flow from God. But morals are defined as "conforming to a standard of right behavior". That "standard" is set by religious teachings.