Tax credits to attend private school. Vocational rehabilitation tuition to attend a religious seminary. Witters v. Washington. Deaf Interpreter at public expense even saying Lord's Prayer for student at Catholic School. Student Groups cannot be denied equal access to student activity funds because they are Christians.
Government can provide neutral reading support even on religious school campus.
The financial assistance is available to a broad class of individuals defined without regard to religion. The benefit was intended for a public purpose, i.e. an educated citizenry. The decision to attend a religious school was entirely voluntary, and thus religious schools are only indirect beneficiaries. No money goes to private school directly, only if individuals voluntarily choose such schools.