The Republican Party was founded on an anti-slavery platform. You could not be a slave owner and a Republican at the same time. That is like saying there were Roman Catholic Rabbis.
In the UK, they have an Anglican (Church of England) imam.
Rowan Williams, who in his capacity of Archbishop of Canterbury is the head of the Church of England. Our thanks are not due this cleric, however, for his appalling pronouncement last week that we had better get used to the imposition of Shariah law in Britain since it is now, in his words, "unavoidable."