The Blaine Amendments had one target only; the Catholic church.
Indeed, in most states, the State Supreme Courts have not applied the Blaine Amendment to protestant private schools nor to the "protestant common schools" today called public schools.

You will find Baptist Ministers at most public schools and universities who oppose aid to Catholic schools using Jefferson's "wall of separation" but obviously it doesn't apply to them and ironically they oppose Catholic priests and nuns teaching at public schools on the same ground, but they favor discrimination in hiring against Catholic lay persons to keep the public schools and universities predominantly protestant.

Indeed, Presbyterians, Baptists, and Methodists conspired with the League of Women Voters, the KKK, and the KKKW to kick Catholic teachers out of the public schools founded by Catholics.

Catholic students face discrimination in the public schools and universities daily.