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Tenement house containing a church, it is still building=apartments not building=church
building:use=place_of_worship is an acceptable addition
Church building no longer used for religious purposes, converted into apartments. building:use=apartments building=church would be a correct tagging here

Three cases

  1. Built as a church, used as a church: building=church + [ amenity=place_of_worship + religion=christian ].
  2. Built as a church, used for something else or closed: building=church + tags for current use.
  3. Built as something else, used for Christian worship: building=* + [ amenity=place_of_worship + religion=christian. E.g., warehouse building converted into place of worship.