The Pew Forum on Religion and Public Life has charted the income data of various religions in the USA, showing which religious traditions tend to be more affluent and which tend to be poorer (see the writeup in the NYT here).
As you can see from the chart, Reform Jews come out on top, closely followed by Hindus and then Conservative Jews and Anglicans. Jehovah’s Witnesses and Pentecostals are at the bottom of those listed. Not surprisingly, higher income numbers bear a pronounced positive correlation with higher percentages of college graduates. Also noteworthy is how those Christian traditions that tend to emphasize tithing to the church—and push that as a means to blessing—fall on the lower end of the income spectrum. Shocking, really.
Of course, that modern emphasis on tithing is just that—modern (as can be observed in George Müller’s teaching on giving).