Does college make students more liberal and less religious? Nope:
The Indoctrination Myth, by Neil Gross, Commentary, NY Times: THE Republican presidential candidate Rick Santorum recently ... called colleges and universities “indoctrination mills” for godless liberalism. But is this true? Does attending college actually make you more liberal and less religious? Research indicates that the answer is: not so much.
It’s certainly true that professors are a liberal lot and that religious skepticism is common in the academy. ... But contrary to conservative rhetoric, studies show that going to college does not make students substantially more liberal. ... Studies also show that attending college does not make you less religious. ...
I've always thought this is more about discrediting academic voices than the supposed indoctrination itself. The author gets this:
So why do conservatives persist in attacking higher education? There’s no doubt that in terms of overall curricular content and campus culture, most colleges and universities do skew more to the left than to the right. And research by the sociologists Amy Binder and Kate Wood confirms that this can be a frustrating and alienating experience for conservative students, even if it’s not serving to indoctrinate anyone.
But that alone doesn’t explain the intensity of the animus. Doing so requires some historical perspective. Conservatives have been criticizing academia for many decades. Yet only once the McCarthy era passed did this criticism begin to be cast primarily in anti-elitist tones: charges of Communist subversion gave way to charges of liberal elitism in the writings of William F. Buckley Jr. and others. The idea that professors are snobs looking down their noses at ordinary Americans, trying to push the country in directions it does not wish to go, soon became an established conservative trope, taking its place alongside criticism of the liberal press and the liberal judiciary.
Academics provide a powerful counterforce to conservative ideas, both through evidence and argument, and to the extent those voices can be discredited, it benefits conservatives. At least politically. But there is a danger in this as well. Discrediting professors as out of touch, elitist, individuals discredits the entire institution of higher education, and this undermines our pursuit of basic science and education that will be needed to compete in a globalized economy (e.g. by making taxpayers less willing to fund these institutions). Most of the academics I know don't have a political bone in their body, and if they do it does not affect their research in any way. They simply want to find the truth, and discrediting the entire institution of higher education to mute the few who do speak out reduces our ability to solve important problems.