In the great majority of films depicting church services of the past one or two hundred years, I have noticed that the song of choice is usually “Rock of Ages.” It has a decidedly old-fashion sound to it, seems to communicate some nostalgic irrelevancy, and I suspect you seldom hear it in contemporary churches.
However, the idea of God being our rock is a biblical message particularly found in the Psalms. There are many references like this one:
The LORD is my rock, my fortress and my deliverer; my God is my rock, in whom I take refuge. He is my shield and the horn of my salvation, my stronghold. Psalm 18:2 (NIV)