There's a Mormon character in one of ABC's new fall series. And viewers will learn this when they see him wearing nothing but his temple garments. That's just one of the reasons that members of The Church of Jesus Christ of Latter-day Saints may not be particularly pleased with that character in the pilot of "Quantico," which is scheduled to premiere on Sunday, Sept. 27, at 9 p.m. on ABC/Ch. 4. The series is about a bunch of new recruits who arrive at the FBI training base in Quantico, Va., for training.