    Mormonism and Christian Scientists are not regarded as being Christian nevermind Protestant and they are widely regarded as being sects on the periphery of Christianity.    Legally they are, and they refer to themselves AS Christian. A lot of Anglicans I know don't consider Catholics to be Christians, and my father dismisses protestant beliefs as heretical drivel. Technically, despite what all the other groups think, they are all christians.       http://www.nationmaster.com/graph-T/rel_rel/EUR  <--- lists Anglicans and Roman Catholics together as the largest group. Doesn't give a breakdown, but shows that yes, Catholicism IS a major religion of the indigenous population of England (as originally questioned - Catholics were called immigrants for some unknown reason earlier). If you view the religions section (by clicking religion name), it will show the countries with a majority of certain religions. Note how UK isn't Catholic - but neither is it Anglican, the Church of England :)       . I would have thought that within England which is a Protestant country by constitution that the Anglicans were the majority church. When you add together the Baptists, Methodists and United Reformed Church along with other smaller groupings they easily outnumber Roman Catholics.    Indeed, when all these groups band together under the loose label protestant they outnumber the Catholics (just as there're 40% Catholics in Northern Ireland and 45% protestants). That's not the issue in question. The issue in question is:       Catholicism is not a common religion in England. What were you saying about immigrants again?    .