Once a denomination leaves a building it’s no longer part of their denomination. Didn’t you read what I wrote? And in answer to your question, what had the Catholic administration done to keep it Catholic? There’s a Catholic church in Italy that has been abandoned for over 30 years because of an earthquake that killed 3,000 of the town’s inhabitants. It’s a wreck. Is it still a church? The Bible describes the church as the people not the building.