The first of two lectures given at an'Alpha & Omega'Conference at the Campus Church, Welwyn Garden City on 27 February 2016. We examine the three most popular cosmological arguments advanced by atheists in their attempt to prove the non-existence of God, namely (1) that God is an invention of the human mind; (2) that the idea of God has no explanatory value (the "Who made God?" question); and (3)that the universe created itself. Not only do we see that these arguments are based on fallacious reasoning but that they actually lead logically to the neccessity of God.