The World Christianity Maps
…discovered patterns that are incredibly clear. Catholics are most visible in much of the Northeast and Canada, with Lutherans taking the Midwest, Baptists the Southeast, and Mormons unsurprisingly taking much of the mountain states. Methodists, interestingly, seem to primarily be most visible in a thin red line between the Southern Baptists and everyone else.
Taking a closer look at Europe, there is a fascinating split between Orthodox Eastern Europe, Protestant Germany, and Catholic everywhere else. In places such as the UK that contain more Protestants than Catholics it is likely that people aren’t using the actual term “Protestant” as a signifier of their religion.
These are a more detailed look specifically at Christianity after some of their earlier work on the Google Geographies of Religion that look at searches for the different figures of religion across the globe.