Governments aid religious organizations in a wide variety of ways. For example, governments provide vouchers that students can use to attend private schools, support religious organizations that provide social services to the needy, and provide funding to ensure that religious houses of worship are safe from attack by terrorists and accessible to the handicapped. All of these programs, and many more, are permissible under the Establishment Clause of the Federal Constitution. The Establishment Clause requires only that government programs have a predominant secular purpose and do not improperly advance religion...