Christians use the word moral nihilist do so for it's negative emotive connotations. Moral philosophers don't use the word moral nihilist much anymore. In contemporary metaethics terms it's called moral anti realism and comes in different flavors ranging from error theory to relativism to noncognitivism to non-objective absolutism
It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all. - Denis Diderot
We are the United States of Amnesia, we learn nothing because we remember nothing. - Gore Vidal
We are the United States of Amnesia, we learn nothing because we remember nothing. - Gore Vidal