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While not given as a percentage of revenue, this post estimates the Catholic Church's charity as anything but 'tiny': https://old.reddit.com/r/Catholicism/comme

• exclusiv 6y ago
  People also forget the huge network of Catholics who contribute their own personal time for the benefit of the local communities (and also the non-Catholics they activate with their local events). It would be hard to quantify, but in the analysis you posted that's not included.