>>Christians beat their chest about abortion and contraception and then ostracize women who become pregnant out of wedlock.<<
Please explain what one thing has to do with the other. You can make your own decision about premarital sex, but the church (and this school) has made it pretty clear that its not a good example of Christian behavior. If you’re going to work for such a church or school, you follow their teaching.
There’s no ostracism. This was an employment contract where one party breached their duty of performance.