In case of UK it's wrong thing. Since the Protestant Reformation in the 16th century, the British Monarch has also been the official supreme governor of the Church of England, the "Defender of the Faith" - fidei defensor. Each coronation takes place at a ceremony at Westminster Abbey, where the new monarch is crowned and blessed by the Primate of the Church of England (the Anglican church), the Archbishop of Canterbury. In addition, twenty six Anglican bishops sit in the House of Lords and Parliament itself starts each day with Christian prayers. No offence, but it's looks like not the best place for Muslims politicians.