The Supreme Court’s review of public funding for religious education is dangerous in several ways.
The separation of church and state has kept the United States free from the absolute power that accompanies church / state marriage. The unification of the interests of Church and State invites a return to absolute power contrary to the founding principles of America.
Public funding for religious education may well lead to a proliferation of denominational schools for Catholics, Protestants, Baptists, Mormons, Muslims, Buddhists, Hindus, Scientologists, Native American religions, etc. Each funding of religious education would take money out of generic public education that creates the common ground necessary for public debate.
The move towards funding religious education also has negative potential for religious organizations. Public funding could lead to taxation of religious property. The large, dominant religious organization in the United States may well pay more in property and income taxes than it receives for its educational functions.
Funding for religious education opens the door to the absolute power that typically accompanies religious / state unification, reduces funding for generic public education, and invites taxation of religious resources. Changing the long-standing constitutional separation of church and state is dangerous in many ways.