NASHVILLE (AP) — Worried they could be sued by gay couples, some churches are changing their bylaws to reflect their view that the Bible allows only marriage between one man and one woman.Although there have been suits against wedding industry businesses that refuse to serve gay couples, attorneys promoting the bylaw changes say they don't know of any lawsuits against churches.Critics say the changes are unnecessary, but some churches fear that it's only a matter of time before one of them is sued."I thought marriage was always between one man and one woman, but the Supreme Court in a 5-4 decision said no," said Gregory S. Erwin, an attorney for the Louisiana Baptist Convention, an association of Southern Baptist churches and one several groups advising churches to change their bylaws. "I think it's better to be prepared because the law is changing. America is changing."In a June decision, the U.S. Supreme Court struck down a provision of the federal Defense of Marriage Act that defined marriage as between a man and a woman for purposes of federal law.