To the outsider, the Anglican Church may well seem one of the more liberal of the Christian denominations. While the Roman Catholic Church refuses even to debate the issues, Anglicans have gone ahead and ordained both women and homosexuals to the priesthood. In Canada, one Anglican diocese has gone so far as to bless same-sex marriages. Theologically, the best-selling books of retired US bishop John Shelby Spong represent progressive Anglicanism at its extreme. Not only does Spong argue that the world view of the Bible is incompatible with contemporary scientific knowledge, but he also suggests that St Paul was gay and that Christians need not believe in god.