Law professors, June Carbone and Naomi Cahn, wrote a recent book titled, "Red Families v. Blue Families: Legal Polarization and the Creation of Culture."
They suggest that "church shopping" is contributing to the polarization of the country.
They begin this essay with a shocking paragraph about Catholic women and abortion (see below), but the real nut of their research is here:
The difference in viewpoints between traditionalists and modernists is profound -- and has dramatic effects on today’s culture wars.
Here's the paragraph that begins the essay. (An aside: I wouldn't have begun the essay with this example, because mentioning "Catholic women" and "abortion" in the lede turns off too many readers right at the start.)
"A report this month on who gets abortions showed some surprising results: Catholic women are about as likely as any other woman to terminate a pregnancy. Then again, the striking thing about American Catholics is that they look almost exactly like the average American."