religion is Catholic. the most populated food in Switzerland are Gruyere, vacherin, and appenzeller. The Chillon Castle is one of most populated building in Switzerland. Switzerland . Switzerland is not a nation state. Switzerland is the most populated country in Europe. In Switzerland every body has the same type design on there mailbox.In handles but not door knobs on there door its make its it easier for them to get in only when the door is unlocked.