If you want a good university AND one that has a strong Christian presence, take a good look at Auburn University. It is a secular university, but there are some strong, non-denominational ministries available. There is lots of evangelism and Bible study and several, solid, Bible-is-the-Word-of-God churches to nourish and train believers in the area. Trinity Presbyterian in Opelika is just one such church.
I second the recommendation for Auburn University. I think one searching for a Christian atmosphere can certainly find it there. There are the other elements as well, but tolerance of others is a hallmark of Auburn.