A representation of these data that captures both views at the same time is a scatter plot (not a bar chart) with population on one axis and muslim population on the other, on a log-log scale. Maybe I'll find time to make that chart later today (should take 15 minutes with R, but B is nagging me to put together some IKEA furniture ;-)

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman