The case could lead to a major change in the law on religion that would go well beyond prayers at council meetings. Last year, a federal appeals court ruled that the town of Greece, N.Y., near Rochester, had crossed the line and violated the 1st Amendment’s ban on an “establishment of religion.” For years, the town supervisor had invited a local minister to deliver an opening prayer at the council’s monthly meeting. Members of the audience were encouraged to join in the prayers. Two residents, one Jewish and one an atheist, had complained for several years that the prayers were offensive and inappropriate. Until they sued in 2008, only Christians had been invited to lead the prayers.