Christians: why do you think you're experts on Biology and Astrophysics?

The question could be turned around to you about spirituality. When God created everything, Biology and Astrophysics were included so man could explain things. But natural man doesn't want to explain things with God included. God says He uses the foolishness of this world to confound the wise. His word also says that a man who is wise in his own eyes is a fool.