Colleges like Asbury have a competitive full-tuition scholarship (they give out two per year) - I got one of their 50% tuition scholarships (they give out 16 per year)... Cedarville University has a competitive 75% tuition scholarship and some 50% tuition as well.
From what I could see, though, Christian schools aren't as generous as secular schools are. Grove City only meets ~35% of "need" whereas some schools, like Vanderbilt where I'm attending in the fall, meet 100%. If you need a full ride to not go into debt at all, I'd say you're probably pretty poor, and if you're pretty poor, you can go to a secular university that meets 100% of demonstrated financial need for very cheap. If this is your first child that you're sending to college and you don't know what "need" or FAFSA is, the college financial process has changed quite a bit since you likely went to college and I'd ask someone to explain that to you - many public schools don't give out much aid at all and don't meet need - whereas there are several private universities that do - I'd recommend researching those. Here's a list to get you started: CSLF : IF : Colleges That Meet Financial Aid Need
Wheaton, as far as I can tell, doesn't give out many scholarships at all. I didn't even apply there since they don't even offer transfers merit-based aid. I don't mean to preach to you, but if you're a Christian I wouldn't go for necessarily the cheapest school - our God is much bigger than any bill a college could give me - so I'd seek the college that is his will for your life exclusively - "if it's God's will, he'll pay the pill."
Oh yeah - there's a really cheap Christian school in Arkansas - College of the Ozarks? It only costs like 5k a year if I remember (room and board - tuition is free) - but they admit on a need-aware policy - that is to say, they want to educate poorer people. Something like 10% of each incoming class is reserved for people who are admitted on pure merit. It's academically pretty good too, from what I could tell.