Why doesn't God physically reveal Himself?

Why doesn't God physically reveal Himself more like He did in the Bible? If God wants a relationship with us, why wouldn't He show Himself more clearly? In this clip Dr William Lane Craig answers this question during the Q&A; time of his debate with Dr Alex Rosenberg. On February 1st, 2013 at Purdue University, Dr Craig participated in a debate with Dr Rosenberg on the topic, "Is Faith In God Reasonable?" Over 5,000 people watched the event on the Purdue University campus along with tens of thousands streaming it live online from around the world.