This example visualizes the global spread of religions using data from the Pew Research Center, showing population figures for each religious group by country. The visualization displays a map view of countries, highlighting the dominant religion per country and enabling comparison of religious population sizes across regions. The code uses D3 v7’s `fetch` to load a CSV file, `csvParse` to parse the data, and converts string values to numbers for quantitative analysis. The data includes categories for Christians, Muslims, Hindus, Buddhists, and other faiths, with null values representing populations under 10,000.