Holocaust survivors said Monday they were through trying to negotiate with the Mormon church over posthumous baptisms of Jews killed in Nazi concentration camps, saying the church had repeatedly violated a 13-year-old agreement barring the practice. Leaders of The Church of Jesus Christ of Latter-day Saints say they are making changes to their massive genealogical database to make it more difficult for names of Holocaust victims to be entered for posthumous baptism by proxy, a rite that has been a common Mormon practice for more than a century. But Ernest Michel, honorary chairman of the American Gathering of Holocaust Survivors, said that is not enough. At a news conference in New York City on Monday, he said the church also must "implement a mechanism to undo what you have done.