I mean no disrespect but for God’s sake, if your children haven’t gotten your message by college age, when the heck are they going to?
We homeschooled, but "threw our son into the pit of filth" (your words, not mine) when he was 15 (he dual enrolled in college, never went to high school.) Going to college and still living at home during your high school years is a great thing. They come home and discuss what has been taught, and you can have meaningful conversations how to discern a prof's agenda, a text's bias, etc.
Our son graduated college at 19, and is in grad school. His faith is strong, he has not been seduced to "the dark side," politically or spiritually.
"Bring up a child in the way he should go...and he will not depart from it." We've raised them to know the Truth, and the Truth sets them free. They can be exposed to "filth" and know it is "filth." You can't isolate them from the world forever.
“We’re not going to throw our sons and daughters into a pit of filth after spending so many years instructing them in the ways of the Lord. “
Just to let you know. I work at a large university. Some of the mostly Godly people I know are college professors. One of our local evangelical churches uses professors as clergy. The problem is that many of the kids don’t know how to act properly. That is true of college, the military, the working world, everywhere.