While I totally understand the desire to want to refute what these teachers/professors are saying, at the same time I'd advise caution before trying to debate what they are saying in a classroom. While the Bible is the ultimate authority, it also requires a deep understanding of both the content as well as biblical/ancient history to really be able to debate its contents with non-believers, and especially those who have a background in ancient history/sociology. As Christians, our faith is extremely important, however non-believers look at hard facts and evidence. That jump from faith to facts-only can be a hard jump to make.
IMHO, a lot of damage has been done to the Christian cause by unprepared Christians trying to debate/confront non-believers without truly being ready. Satan is fully armed and ready to go, and he likes to try to bait Christians into loaded arguments. We need to be fully prepared (knowing the Word, understanding the history around it) before debating with non-believers. Discernment is also necessary... we need to be led by the Spirit regarding timing and what specific people to confront/debate against. Satan loves nothing more than a Christian getting pwned, because he knows HE will be pwned in the end.
I know that in my college days, I had several professors that also would spout their opinions about Christianity and the Bible. Some professors I knew in my gut that I could not/was not meant to confront them, however I was able to discuss some of the subject matter with my classmates and make a much better impression with them on a personal level. Conversely, one professor I DID feel led to debate with, and while I received a slightly lower letter grade than normal, he also conceded that I made an extremely good case on the topic at hand. Did I change his mind? Probably not, but I hope that a seed was planted with him.
In the end, we are to be "wise as serpents, gentle as doves". The wisdom is knowing what and when to say (or NOT say) something, and the gentleness is knowing HOW to say it when we do.
ETA: And I FULLY agree with the folks that say that you need to live it as well... all the Christian/Biblical knowledge in the world without a personal walk with Christ will fall flat every time.