Not in this particular area. That sounds confusing. If you are talking about a person in a particular country you would identify him by his country, likewise with Religion. You could say an ardent Muslim and mean a Jihadist, or an ardent Christian and mean a Crusader. You could go back into history and say in 1939 he was an ardent German and mean Nazi. You would not say in 1939, Germany was an ardent land.