MAYFIELD, Ky. — Mayfield First United Methodist Church, a century-old temple with stately columns and stained-glass windows, has long been an anchor in the life of Kathy O’Nan, the city’s 68-year-old mayor. Besides First United Methodist and First Christian, the red-brick First Presbyterian Church on Mayfield’s main street and Fairview Baptist Church, about a half-mile away, were destroyed as well. …