Charles Darwin grew up embracing the ‘intelligent design’ thinking of his day—William Paley’s renowned argument that the design of a watch implies there must have been an intelligent watchmaker, and so design in the universe implies there must have been an intelligent Creator. Concerning this, Darwin wrote, ‘I do not think I hardly ever admired a book more than Paley’s “Natural Theology”. I could almost formerly have said it by heart.’Through time, chance and random processes, you can read the rest of the article, including Darwin's excuses and rejections. Or you can use the intelligent choice and click here to read, "Darwin's Arguments Against God".
Nevertheless, Darwin spent most of the rest of his life attempting to explain design in nature without the need for any purpose or a guiding intelligence. He labelled himself an agnostic, and gave us his ‘Religious Belief’ in his Autobiography, written in 1876 when he was 67.