Naturalist. That's a good label. Those with whom you are debating argue their point not with the objective dispassion of science but with the emotional zeal of religion.
Materialism/atheism/naturalism is a superstition. As misguided as the poor pagans were, it is more rational to believe in a Greek pantheon of gods than to assume we exist by accident.
Yup, it is not even a valid philoshy. It cannot account for what makes us human - art, thought, conscience, logic, mathematics, and even philosophy itself.