The Eurabia Analogy I've Been Looking For

I was thinking about the tenor of the European debate over immigration issues and how it differs from our own, and one thing I came up with is that it's more similar to an older American debate, focused on the first wave of Catholic immigrants, in which people were troubled by the notion that Catholicism (a religion with hierarchy and authority at its very core) might be incompatible with democracy. Unfortunately, I knew very little about that debate except for half-remembered snatches of Stephen Macedo's Diversity and Distrust. But Ross pointed to this gem from The Atlantic's archives, a 1927 exchange on Al Smith's presidential candidacy which takes this subject up at length in the second half of Smith's contribution.