It's been a while since college...
You don't really give indication to your personality and how you deal with conflict. In classes where I had really liberal teachers that could NOT comprehend a view other than theirs... I dealt with them as matter of fact. They needed to be spoon fed the lame ideas they dished in order to pass. So yes, I would take 10 minutes, write papers that were exactly opposite of my personal views, get an A, be told I was brilliant for thinking like them... Me on the other hand thinking... Yeah, I'm brilliant. I know how to pass a rediculous class that I HAVE to take in order to get the degree I want, with little to no effort. Time IS precious. I wanted to focus on my important stuff. Seriously, people that just want to hear their own voice often teach the easiest classes to pass. Because they truly aren't interested in an education. And see I learned something! How to get by in a world that doesn't always agree with your views. CHOOSE YOUR BATTLES!
I can't imagine you are selecting a degree that is opposite your belief structure. So your core classes should really be uneffected.
Honestly, there was too much stuff to be covered in core classes that were unrelated to faith... to discuss faith. The topic just never came up. No time for it. And really you can control your social situations. If someone decides to challenge you , tell them you're not interested. The end... Life is to short to engage.
You're not very likely to hang out with people that you don't see eye to eye with. Your time WILL be limited... if you're actually focused on school.
Switching to a secular environment is really not as scary as it sounds. UNLESS you happen to be wishy washy (doesn't sound like it)... You already know who you are, and what you are focused on. That kind of maturity, and confidence doesn't generally get challenged. You're not an easy target. Well, this is in my experience.
You will find that people who like to create debate, generally do it with those that are easy targets. Those that aren't good public speakers, those that start to back peddle. I can remember in one class I had, a guy who was no where near as smart as he liked to pretend, would ask questions that made no sense at all during a person's presentation. They couldn't answer the question, because generally there was actually NO answer to it. Or he'd base his question on a presumption that was completely inaccurate or could not possibly exist. He sought gratification in making them squirm. Knowing they would be nervous, and likely not even see the huge gaping holes in his questions. KNOWING they would get marked down for said squirming. I remember when it was my turn to present. So, at the end of my presentation, I turned right to him... So, do you have any questions???? Catching him off guard, he couldn't think of one during my entire Q & A... It was actually quite ammusing! "What about now... no? Nothing? How weird."
College was the most fun I had with regard to my education. I worked hard, in school and out. A very rewarding experience. I hope you enjoy it as well!!!!