The Catholic Church considers itself a continuation of the earliest Celtic Christian communities .
Catholic Church 's formal hierarchy needed to be refounded by the Gregorian mission to the Saxon kingdoms in the 6th and 7th centuries and again following the English Reformation .
The Catholic Church considers itself a continuation of the earliest Celtic Christian communities , although its formal hierarchy needed to be refounded by the Gregorian mission to the Saxon kingdoms in the 6th and 7th centuries and again following the English Reformation .