Can a British royal male marry a woman of any other religion except Catholic?

The British Royal family can in theory marry a person of any religion - or none - except Catholics. So a Sikh, Satanist, Jain, Jew or Moslem would be legally acceptable, but Catholics are not acceptable. This goes back to King Henry 8th breaking with Rome and founding the Church of England with himself at its head. His daughter Elizabeth put it into Law, which remains today.

Some minor royals have married Catholics or converted to Catholicism, but they have had to give up their place in line to the throne.