The Bible Belt -- not liberal coastal cities.
If Southern Evangelicals have no problem donating to mega-churches with pastors who live in mansions and fly around the world in private jets, they can easily be convinced to also donate a few bucks to keep K-Love on the air.
Where are you getting your information from? What kind of bubble are you living in?
When K-Love had a weak signal in New York, they had over 100k listeners in the NY area. In Chicago, where they still subscribe, they have closer to a million listeners. K-Love is not stupid, they know exactly where their listeners, and money, are coming from. If it was "just" the bible belt, then they wouldn't have spent millions (hundreds of millions, actually) acquiring stations in places like New York, DC, LA, Chicago, etc. The station started in CA, so I think there are fans even in more "liberal" leaning areas.
I get it, it sucks to lose historic stations. But don't blame EMF for that, blame poor corporate ownership that purchased these stations at 20X cash flow, then ran them into the ground until they all sounded the same and brought nothing new to the table. And perhaps the industry can learn from that before we lose more historic stations in other markets (or even in NY). All over America there are stations that have huge legacies, but are hanging on to the success of the past. Once those personalities retire, many of those stations have no "Plan B". Something we have already seen over and over again (look at what happened when Howard Stern left the airwaves, many of his former stations are now different formats because, outside of morning drive they had NOTHING).
If EMF was a failure, they wouldn't have millions of dollars to throw at these stations with no debt load. The Bible Belt probably is a major source of donations, but EMF is still a business, and if it doesn't make financial sense to be in a place, they aren't going to buy. It's just that "financial sense" for them often means breaking even on VERY low expenses (Tower and Power, in most cases).