Rand was far and away not a humanist. Humanism exhorts a morality that comes from man but dependent on the collective will of man. Therefore any concept of individual rights in humanism exist solely at the behest of whatever laws men decide to right.
Rand correctly identified individual rights as part of and inseperateable from mans nature.
Only some conservatives reject Rand and as best I can tell its mostly from spite. Rands atheism was a consequence of her philosophy but she never translated her atheism into public policy. She again correctly felt it didn’t belong in politics
You’re more forgiving of her than I am. She could not bring herself to contemplate that the rights “innate in man’s being” were either a completely arbitrary construct possessed of only whatever moral authority Man gave them, or they were divinely vouchsafed us by some Being greater than ourselves.
Nevertheless, in elevating Man to the status of self-Creator, she prescribed a philosophy that gave no man power over any other ...the ultimate in human-centric liberty.