In Washington, D.C., the nation’s capital city, 75 percent of adults do not go to church at least once a week, according to the Gallup poll, while only 23 percent do. Another 2 percent told the polling firm they “don’t know” when asked how often they go to church. When ranked with the 50 states, D.C. was fifth from last in the percentage of its residents who attend church services at least once a week. …