Does evolution deny the existence of God?
No. See question 1. There is no reason to believe that God was not a guiding force behind evolution. While it does contradict some specific interpretations of God, especially ones requiring a literal interpretation of Genesis 1, few people have this narrow of a view of God. There are many people who believe in the existence of God and in evolution. Common descent then describes the process used by God. Until the discovery of a test to separate chance and God this interpretation is a valid one within evolution.