RICHMOND, Va. — In 2003 the Presbyterian Church (USA) experienced its highest percentage loss in nearly a quarter century, the denomination has announced. At the end of 2003, church membership was 2.4 million, down nearly 50,000 from the previous year. These Presbyterians were associated with 11,604 churches, 33 fewer than the total number of churches in 2002. Clifton Kirkpatrick,…