Religious Maps of the United States – Orthodox and Muslim Distribution of US population
I'm a big map lover. For (retail) marketing purposes maps can give you new insights and create content suitable for analysis and campaign tactis that lists and bullet points can't. One interesting map for the US is this "Muslims as a percentage of all US residents" from Valparaíso University.
Another interesting map if you're targeting Eastern Europeans is the Orthodox Christian Map.
Source: Valparaiso University via Flowing Data