As the lights dimmed and the excitement built, “American Idol” finalist Chris Sligh once again prepared to go on stage. This time, however, Randy, Paula and Simon were nowhere to be found. Sligh performed Sept. 13 at Sylacauga High School for the Back to Basics student conference tour, sponsored by Sylacauga-based Footwash Ministries. Footwash Ministries was created by Brian and…