In many cases people are asking you what church you go to so that, if you say you're looking for a church or don't go to one, they can invite you to theirs. Many good people love their church and want to share it.
When I lived in the North all my neighbors were Catholic. They very hospitably invited me to go to mass with them on Sunday. When I declined with a polite smile, on grounds that I'm not Catholic, they were horrified and suspicious. One woman cancelled plans to have her daughter babysit my child when she learned that Mr. Fairview and I aren't Catholic. And I have Protestant Southern kin who think even another conservative Protestant church is of the wrong type, its membership destined for hell. So it cuts both ways; there is ignorance and religious prejudice among Christians everywhere and it can't be ascribed to Northerners or Southerners. The Devil rejoices.