Indeed this is part of his problem. The Archbishop of Canterbury Justin Welby, is not "Pope" of the Anglican Church. In fact the Anglican Church does not exist outside of England but is worldwide, an organization of religious believers, not a single organisation. It is even called different things in different countries. (Church of Scotland, Church of Ireland, Episcopalian Church etc.)
Justin Welby is almost in a secular sense their “chairman” rather than their” boss”. So, he is between a rock and a hard place, having to balance the beliefs of an English Church that is reasonably broadminded and filled with people who do not take the whole “God Thing” too seriously and, for example, some African Churches who take it extremely seriously.