Well...
I don't really know anything about Christian colleges, so this is mostly just wild assumption.
But it's not really a secret that the higher your education and/or intelligence, the more likely it is that you become/are an atheist. Not saying that there are no great minds who are religious, it's mostly a matter of percentages and likelihood. A person like that might be more inclined to take a job at a university/college that had no religious afilliations, being more in tune with that person's view of life. Therefore, I would assume that you would find a better (or at least smarter) faculty at a non-christian college.
But that's just speculation.
I don't really know anything about Christian colleges, so this is mostly just wild assumption.
But it's not really a secret that the higher your education and/or intelligence, the more likely it is that you become/are an atheist. Not saying that there are no great minds who are religious, it's mostly a matter of percentages and likelihood. A person like that might be more inclined to take a job at a university/college that had no religious afilliations, being more in tune with that person's view of life. Therefore, I would assume that you would find a better (or at least smarter) faculty at a non-christian college.
But that's just speculation.