For most of our history, American children have been educated in three ways: private schools, home schooling, or public schools. Recently, a fourth option has become available: charter schools.
Over the last decade or two, charter schools have grown in popularity, but they remain controversial. They funded by taxpayer dollars, but managed by private entities. Ironically, they have been criticized both for being "private schools in disguise" and "public schools in disguise."
Being fueled by government money, they have been required by courts to refrain from any religious instruction or organized religious activity. Regular supervision by litigation-minded public interest groups has enforced those court orders - with one exception.
While keeping charter schools scrupulously free of Judeo-Christian spirituality, this scrutiny has overlooked a growing number of charter schools which are allegedly centered around Middle Eastern culture, but which are in fact functioning as vehicles of Islamic instruction.
Muslim leader Fethullah Güllen has organized a network of approximately 100 charter schools, instructing almost 35,000 students, with an emphasis on Turkish culture. It is notoriously difficult to determine where culture ends and religion begins.
Some critics have noted that the Turkish charter schools have imported not only their teachers, but in some cases also other employees. It will take some work to show that this is educationally or economically necessary.
Most questions center around Friday prayer services offered in the Islamic charter schools. Just as in a public school, students are allowed to gather for prayer during non-instructional time. But if the services are led and organized by school employees, that would seem to be a violation of standard policy.