Southern Baptist chaplain Fred Holcombe Jr. leads a flock numbering 3,500–5,800 people — the population of a small town. But this “town” is more than 18 stories high, 1,123 feet long, 200 feet wide and takes up 4 1/2 acres. When fully loaded, this town weighs in at 95,000 tons — yet it floats. It is the USS Enterprise, the…