The battle pits two residents of an upstate New York town, backed by a civil liberties group advocating for the separation of church and state against a town supervisor supported by a prominent, evangelical Christian organization.

Both groups - Americans United for Separation of Church and State and the Alliance Defending Freedom - have multi-million dollar budgets and litigate on a variety of related issues, often against each other.

Linda Stephens, 70, an atheist, and Susan Galloway, 51, who is Jewish, are both long-term residents of the conservative-leaning town of Greece, a Rochester suburb of around 100,000 people located about 300 miles northwest of New York City. They filed a lawsuit in 2008 against the town objecting to the public prayer that precedes town board meetings, claiming it violates the U.S. Constitution's First Amendment prohibition on government establishment of religion.