I don't think so. 17% Catholic is way too high for the rural south even if it is 5% Latino. 80% affiliated with a religious congregation also is probably higher than you can actually find anywhere for a primarily Evangelical area because many Evangelical churches do not have a well-defined concept of affiliation or have many unaffiliated congregants. To have 80% you would need to be in a Catholic or Lutheran area where affiliation itself is a large part of the cultural identity.
Surely there's somewhere in rural Louisiana that is at least 17% Catholic.
