You have to admire Billy Bob Thornton’s consistency. A dozen years ago, when he was up for an Oscar for his self-directed performance in “Sling Blade,” he told the Washington Post, “I think religion is a good thing. The problem is people who take it into their own hands and use it for their own purpose.” Back then he was talking about “guys that wear white shoes and have their own TV shows.” Today, he’s singing, on a new album, about religious fanatics bent on getting to heaven who “believe that whoever they have to stomp on to get there is fine.” The album, called “Beautiful Door,” is Thornton’s fourth–his second with his band from his pre-Hollywood days in Arkansas, Tres Hombres–and critics are calling it his most ambitious. “It’s a collection of stories about life and living and death and dying and how important both are,” he told Austin (Texas) Daze recently. He sings from the point of view of a person left behind by a suicide, and protests war in three songs, “Beautiful Door” among them.