BIRMINGHAM, Alabama (Reuters) - The largest U.S. Presbyterian Church body approved a measure on Tuesday that would open the way for the ordination of gays and lesbians under certain circumstances. The new policy was approved on a vote of 57-43 percent among 500 church representatives at the biennial meeting of the Presbyterian Church U.S.A. It gives local church organizations more leeway in deciding if gays can be ordained as lay deacons and elders as well as clergy, provided they are faithful to the church's core values. "It permits local governing bodies to examine candidates on a wider criterion than sexual...