Original: It is given high importance in the Anglican Church, Eastern Orthodox Church, Assyrian Church of the East, Oriental Orthodox churches, the Roman Catholic Church including the Eastern Catholic Churches and the Old Catholic Church, and most Protestant denominations.
Simplified: Since its original formulation it continues to be used in the Roman Catholic, Syrian Orthodox (Jacobite), Eastern Orthodox, Oriental Orthodox, Assyrian, Anglican, Lutheran, and most other Protestant Churches. This clause is one of the main differences between the Roman Catholic Church and the Eastern Orthodox Church. The Catholic Church has this clause, the Eastern Orthodox Church does not.