I think that location might trump race or religion in some cases, usually between the urban/rural divide but also regionally. There were splits where Catholics went for the republican by 60% and in another state went for the democrat by 60%. Also, exit polling for religion is only done in a very limited number of states, and then applied as a national statistic. Which seems to me to be potentially completely misleading when you have reversed splits by state like that in a group.
Freegards
These are excellent points and I'm sure you are right, that we can try to read too much into exit polling data.
I find this stuff interesting, but perhaps I've dived too deep into the weeds. I think the author's main point still stands.
Asians and Hispanics always and everywhere vote Democratic. As we import more and more of them, and spread them seemingly to every States and sometimes it seems like almost every Congressional District, the chances for the GOP to win national elections goes down.
At some point in the near future the Dems will achieve the lock-on that they have been bragging about for 20 years.
The GOP doesn't have any plan to overcome that.