According to Dictionary, "ethnicism" is a noun defined as heathenism, paganism, superstition and idolatry. "Ethnicism" is further described as the state of not being a Christian.
Rejecting traditional Christian views, ethnicism is an ideology unto itself. Ethnicism focuses on singular superiority within a narrow ethnic group and is often racist against those outside of the selected group.
Ethnic nationalism is referred to as ethnicism or racial nationalism when the nation is defined in terms of race and ethnicity. The shared heritage includes a common ancestry, culture, faith and language.
Ancient Greek historian Herodotus was the first to state the main characteristics of ethnicity. His account of defining Greek identity lists kinship, language, cults and customs as ethnicism.