Well, I've also had some "Christian college" Courses in my later years. It did help with the understanding of reading and interpreting the main languagfes of the Bible.
But, I will say this, because I questioned enough of the Teacher's teachings at times, I'd fail classes, but when went before the board for my actions, they passed me in the courses.
But, Christian institutions are just like all the rest of the world, run by falable men, including people like you and I. They have thier place in Service for God, just as Churches and each of God's Children.
And rather than speaking against being involved with them, those who do so, should instead go to each of them and work at bringing them to particular Truths' of God.
Remember, God declares all men are equally born in sin. That means, we are no better than those in or at those "institutions"- Admin., Teachers or students alike.
And neither any of you here, nor I, have or understand all Truths' of God, so lets stop speaking down about them, or we'd have few Ministers leading flocks.
"Callings" of God are from God and are not necessarily a contract on paper. Yet, for the unsaved, there are the certifications that can help Ministers get further within the system, when they need to be involved.
God declares all things have thier time and purpose on this Earth. Thus, I say- "Thank God" for institutions when God can use them to train Ministers in just one of His many ways to do so.