Why is ancestor worship considered an ancient form of Finno-Ugric religion?

Ancestor worship is considered the oldest form of Finno-Ugric religion because its foundational terminology—including words for "grave," "hades," and "soul"—dates back several millennia.1

This practice functioned as a vital family institution, establishing a reciprocal relationship between the living and the dead. Within this social framework, ancestors were viewed as integral members of the family who possessed specific rights and duties. They were believed to protect the family's happiness, assist in securing their livelihood, and serve as moral guides, counselors, and judges.1

The antiquity of this tradition is further evidenced by the deep-rooted nature of its associated rituals, which encompass everything from funeral preparations and annual memorial ceremonies to offerings made during seasonal transitions. Additionally, the practice of name-giving—where a child is named after a deceased relative to inherit their personality—suggests a long-standing belief in continuity and reincarnation that is central to the historical development of these religious beliefs.1