It is generally known that Republicans are more likely to be religious than Democrats; in fact, this may be the most basic fault line in our contemporary politics. But the speed with which Democrats are abandoning religion is remarkable. This chart, from Gallup via Breitbart, shows it graphically. The percentage of Democrats describing themselves as religious has dropped from 60% in 1999 to only 37%–a rather small minority–today …

Note that in 1999, there was no significant difference between the parties.