Statistics from an Alternate Universe

A recent study of religion and excess weight sounded plausible until I got to the following paragraphs:

Ferraro's study also found that about 20 percent of "Fundamentalist Protestants," (Church of Christ, Pentecostal, Assemblies of God and Church of God); about 18 percent of "Pietistic Protestants," (Methodist, Christian Church and African Methodist Episcopal), and about 17 percent of Catholics were obese.

By contrast, about 1 percent of the Jewish population and less than 1 percent of other non-Christians, including Muslims, Hindus, Buddhists and others), were tipping the scales with commensurate gusto.

What's the color of the sky on their planet?