What is what religion is the royal family?

The established religion of the UK is Christianity, specifically the Church of England. The Church of England is a Protestant church, and the monarch is its Supreme Governor. This means that while the monarch is head of the Church of England, they are not necessarily personally the most devout member, and their religious beliefs are private. While members of the Royal Family are baptized and often married within the Church of England, their personal faith is largely kept private and is not a matter of public record.