Who are the modern day royals of the united kingdom who reverted back to roman catholicism?

When Prince Michael of Kent married the Catholic Marie-Christine,he had to step out of the Line of Succession.Nothing happened to The Duchess of Kent,when she converted because as a spouse,she wasn't in Line of Succession.The Acts of Settlement requires the monarch to be Church of England,so whomever is in Line of Succession must be Anglican/Protestant.This requirement will probably be dropped one day.