Yes, in most cases religion is specific to a race and nation of people. Native American religion is even specific to a family unit which is why a non-native can't find out very much about it because of how personal and hereditary it is. While it was not the first to introduce conversion, Christianity was the first religion to introduce universalism meaning that you could become a Christian no matter your race or nationality. Even the Roman religion which people were forced to convert to when they were conquered was a state religion that did not apply outside Rome's borders. Every religion began as Native American beliefs did by a family telling stories about it's interaction with it's environment and the spirit world. Those small groups would grow into nations and the religions would be stories about the people such as the belief that the Japanese were descended from the sun goddess Amaterasu.
A race is something black people came up with originally with good intent but now they use it as an excuse to make other people seem offensive by saying that they're judging off race when 99.99% of the time it's cause the person did something wrong or had an attitude... and religion is word that means fake or real devotion toward a god or thing. Christianity however is religion and relationship. it's a belief where they personally know and Love their master but also their ruler maker and Lover. as a being that is but 1 person and is also 3 persons in 1 person. it's confusing I know but God sees that differently.