Lots of students do go to churches of various kinds of Christianity. The religious demographics of California indicate at least 61% Christian (32% Protestant, 28% Catholic, 1% LDS; 5% “other” may include other types of Christians like Orthodox, etc. – see https://en.wikipedia.org/wiki/Demographics_of_California#Religion ).
In terms of conservative politics, the college age generation tends to be less socially conservative than the general population. However, you will probably find some libertarian-ish conservatives in economics and business.