"Ross Douthat has written powerfully about the political consequences of post-Christian conservatism. It turns out that when men and women shed their faith, they dont necessarily get more liberal, but they do get more tribal and vicious."
Tribal and vicious is a reference to something the NeverTrumpers were harping on during the election: that Trump and his supporters are "nativists."
French is the chinless weirdo who nearly ran for President to vainly attempt to help Hillary win the election.
This article is a thinly veiled attempt to tell people that Trump supporters are "post-Christian" because they support deportation.
Nevertheless, I suppose there may or may not be some correct observations in his overall message, except for this tribal nonsense. If anything, the less religious people become, the more liberal, and the more globalistic.