Why?
Imagine that the universe was a practically endless field on which you could lay out every possible combination of events necessary to generate life--presence of raw materials, appropriate proximity to a star, animating events, etc. Given the nearly infinite scope of that imaginary field--the universe--the emergence of life is, in fact, practically unavoidable.
Consider the issue from another angle: it has been said that if you have enough monkeys typing for long enough one of them will replicate the works of Shakespeare. This sounds absurd until you imagine that you have a near infinite number of monkeys and typewriters. Given that, success becomes inevitable. So it is with life.
Is God missing from this picture? No. God's being is the fabric of the universe animated by his grace and emerging from his creative pulse, some 15 billion years ago.