Indeed it did. The study, from the American Religious Identification Survey, showed that Americans calling themselves Christians dropped 11 percent from 1990 to 2008.
Other patterns: "The Bible Belt is less Baptist. The Rust Belt is less Catholic," USA Today reported.
We did a little more digging (thanks USAT) and found these figures on the Sooner state from 1990-2008:
Catholics: Down 1 percent.The "no religion" category went from 7 to 11 percent in Oklahoma, so it's not like the heathens are taking over Sooner land.
Other Christians: Down 6 percent.
No religion: Up 4 percent.
Compared to Wyoming, however, Oklahomans are highly devout. The study shows that the percentage of "no religion" folks in Wyoming (of all places) jumped from 14 to 28 percent in the same time period