Genesis gives us the basis for the only correct way to look at the world, because God has told us how everything came to be. We are not at liberty, as Christians, to think that there is a 'both . . . Evolution and long ages is completely contrary to what the Bible says. That would sound radical to some. Maybe, but it wasn't radical a hundred years back.
Genesis creation is in fact what our society was based upon, the whole of Western culture.
Now we are very wrong to throw it overboard. Of course, he was very successful in getting his own thinking to usurp the authority of the Bible, and we are now reaping the results. In fact, I find it very difficult to believe that fossils formed slowly. The alternative way of looking at the rocks is to believe what the Bible tells us about a massive catastrophic Flood, and there is a lot of evidence to support that view. Now you've got to bury a jellyfish quickly in order to leave its impression behind.