What is the denomination of the British royal family?

Episcopalian or Anglican- over their Church Of England- often abbreviated C.O.E. C.O.E. in the US usually refers to the Army"s Corps of Engineers- of Canal zone fame. No, a construction helmet with a stylized fort in front is not one of Queen Elizabeth"s occupational lids! while we are at it- the heraldic term Cap of maintenance refers to a crown on a pillow- not actually worn- on say, stamps during an interregnum ( interval between monarchs) the term sounds very logical, but does not apply, to a construction helmet!