A stacked bar chart visualizes the distribution of population by religion across countries, ranking countries by total population on the x-axis. Built with the Vega-Lite API, it registers vega, vega-lite, and vega-tooltip, using `vl.markBar` with encodings for country, population, and religion color. The data is loaded via D3's `csv` from a GitHub Gist containing UCI Machine Learning Repository Auto MPG data, though the visualization actually uses religion-by-country data. The chart renders as an SVG, fitting the window size with custom axis styling from a separate config file.