Do you think the Department of Philosophy is retro as well? Theology has shaped humanity, wouldn't it be weird for a school as prestigious as Harvard to not have a school for it?
There are obviously topics that are fairly inseparable from religion, for example hermeneutics, but religion is just another frame of reference onto all the issues that are still important to humans today. Whether you believe that God exists or not is usually not particularly relevant, you just believe the eventual cause is different.