Hey, I've made some maps of the percentage of Catholics to total population in select dioceses. At the moment it is mostly (if not entirely) Roman Catholics to be specific. My first map (Dioceses in Ontario) used a constant scale, but my 2nd and 3rd (and most likely the rest) will use jenks/natural breaks for my shading. It's a pet project of mine as I fool around in QGIS. Do you have any suggestions? Let me know. Making maps is pretty fun, you can message me on Reddit if you have any suggestions.
