The Triangle Adult Soccer League has a lot of different divisions based on age and ability. It has been years since I was involved, but they have a coed division for beginners and recreational players.
http://www.tasl.us/
http://www.tasl.us/documents/FAQ's.pdf (broken link)
PS Found this site for a Raleigh pickup group if you were looking for something less formal than a league. Don't know anything about it.
http://pickupsoccer.meetup.com/205/