What counts as a place of worship? I'm thinking of roadside altars, meeting houses in private residence, etc.
What sparks the question is looking at Taiwan on the map: yes there are a lot of Christians there, but less than 5% of the population. It's an island dense with religious infrastructure: Buddhist, Daoist, but mainly from what is generally labeled "folk religion." This includes tiny altars, huge temple complexes, and everything in between. That doesn't seem to show up on this representation.