With a new TV ad, the United Church of Christ promotes itself as an accepting alternative for alienated believers. *snip* Moving to dispel the idea that only conservative church groups know how to attract new members, the predominantly liberal United Church of Christ is launching a series of TV ads to promote itself as an open and welcoming church. In the first commercial, which will begin airing Dec. 1, two nightclub-type bouncers stand at the entrance of a church, turning away people who don't pass muster. "No, step aside please," one of the bouncers says to a would-be entrant. "No...