The Sun Dance is a sacred ritual lasting 8 days. The first 4 days are dedicated to prayer and meditation including time spent in the sweat lodge and the passing of the peace pipe. On the last day a sacrifice of flesh is offered to the gods. What is the purpose of this ritual.

To bring peace and ultimately be reborn.

Explanation:

The Sun Dance is a ceremony practiced by some Indigenous people of United States of America and Canada, primarily those of the Plains cultures. It usually involves the community gathering together to pray for healing. Individuals make personal sacrifices on behalf of the community.

The purpose of the sun dance is to reunite and reconnect with the earth and the spirits. It calls for a renewal of life and a prayer for life. A large part of the sun dance is sacrifice.

i believe the answer is  the similarity is that both are sacrifices which have the same purpose and sacrifice - jesus christ, but the difference is in offering of that sacrifice.

the similarity is that both are sacrifices which have the same purpose (repenting our sins) and sacrifice - jesus christ.  the difference is in the way of the offering that sacrifice. the sacrifice of jesus on the calvary is sacrifice of his actual living body and blood, but the sacrifice of the mass is the sacrifice of the jesus through bread (body) and blood (wine). in the sacrifice on calvary jesus was offered for us; while at mass he offers himself through us.