"if a church school is not evangelizing, equipping and empowering its students in its faith ..."
Then it is a lousy church school.
The purpose of a religious school is precisely to educate the children of the church's adherents in the tenets of that religion. Now, it's great if the school teaches a rigorous curriculum conforming to educational norms, but the purpose of a religious school is to teach that religion.
Jewish day schools or yeshivahs teach about Judaism. Roman Catholic parochial schools teach about Roman Catholicism. If they also teach algebra, American History, Biology (including Darwin), that's great. But they are there to teach about Jewish or Roman Catholic theology, values, history, etc. They are there  to evangelize, equip and empower students in their faith.