It's the Irish with no religion who drink too much: In honor of St. Patrick's Day, let's test the stereotype that the Irish drink more than they should. GSS respondents were asked if there are occasions when they drink too much.
Percent who drink too much
Catholic Irish 41.6
Protestant Irish 40.6
Irish with no religion 54.8
All white Americans 37.8
So, compared to other whites, Irish Americans are more likely to overdo it, but the difference is large only for those with no church. Maybe the stereotype comes from a comparison with WASPs: only 33.5 percent of them say they drink too much.
While we're at it, I see that 49.6 percent of all white Americans with no religion say they drink more than they should. That's significantly higher than everyone else: Protestants (37.6), Catholics (36.1), Jews (26.4), and others (34.5).