It’s funny you should ask that as I was just watching a lecture by Harold Abelson in which he addresses this exact question.
In case you don’t have the time or inclination to watch the video it can basically be summarized by saying the following. When the Egyptians first discovered geometry it was considered crop science as it’s primary application was for determining crop yields and when to plant and harvest. In the same way now that computers science is applied to computers today. But just like Geometry is really about farming, computer science is not really about computers. Professor Abelson goes on to explain that computer science provides a means to determine proofs for abstract mathematics a reasoning, so that we can understand with definitive proof things that until now were only theoretical.