I heard that dry counties in Georgia (of which there are none now I think) stayed that way because of the Baptists and the moonshiners both donating to whichever sheriff ignored the latter the most. I attended a Southern Baptist church religiously when I was a kid, but it was a suburban church. When we visited my grandparents in east Tennessee we'd go to their rural church, which was ... different. My relatives there did not drink, at all, ever.
Communion in a Baptist church usually is rare and involved grape juice and saltine crackers. My wife used to assist in preparing for communion in her Catholic church (which was weekly of course) and it was diluted cheap wine and some kind of bread wafer the priest would hold up and then separate into pieces. My wife only partook of the wafer part. They have closed communion so I didn't partake.
Small southern towns would have cliques between Baptists, Methodists, Presbyterians, and "other".