I am reasonably sure that few if any British or Commonwealth (Australian, Canadian, New Zealand) Catholics really care. As long as the Monarch is also the supreme governor of the Church of England, it makes sense that the Monarch also be a practising Anglican and also anyone in the line of succession. What should be amended is not that Catholics are barred but instead that all in the line of succession to the throne be practising Anglicans. That is more logical. I would add that real concern should be that Prince Charles is known to be more than interested in Islamic culture and wants to be known as the “Defender of Faiths” rather than the title of Defender of the Faith. When the Queen dies, there will be many messy issues connected to Charles. May be safer to exclude him from the line of succession and just go to King William and Queen Kate.