In focusing on the story of Darwin's religious doubts, scholars too often overlook Darwin's positive contribution to the study of religion. J. David Pleins traces Darwin's journey in five steps. He begins with Darwin's global voyage, where his encounter with religious and cultural diversity transformed his understanding of religion. Surprisingly, Darwin wrestles with serious theological questions even as he uncovers the evolutionary layers of religion from savage roots. Next, we follow Darwin as his doubts about traditional biblical religion take root, affecting his career choice and marriage to Emma Wedgwood. Pleins then examines Darwin's secret notebooks as he searches for a materialist theory of religion. Again, other surprises loom as Darwin's reading of Comte's three stages of religion's development actually predate his reading of Malthus.