Well, IMHO, a person's faith and personal worldview, at some point, must become a "heart issue/conviction" of the individual.
We homeschooled, but then enrolled our son in college (community) in 10th grade. He was taking secular courses, being fed the secular "world view," but he was at home and each day we had the opportunity to discuss what he was being taught and help him work through issues that were being discussed, pointing out the differences and reasons between our "world view" and that of some of the liberal professors.
He's about to graduate with his AA (he's a HS senior technically) and will transfer to our local state university, which also happens to be in our town.
He doesn't seem to have a desire to "go away" to college (lots of friends here and he likes his social life here.) The degree he wants, he can get at the university here. So once again he'll be home everynight, and his dad and I will be able to talk over what he's being taught (I have noticed that once you get past the first two years of general ed requirements, the classes seem more straightforward and more geared toward math/science/technology and you're less inclined to hear the prof opine on his "world view.")
Sooner or later the young person is going to have to face the "world view" of others, and we think it's been good for our son to find out what others think/believe and be able to discuss that with him while he is still at home.
mark