You can not have one without the other. You need both Paley and Darwin.
"Paley's
Principles of Moral and Political Philosophy was one of the most influential philosophical texts in late Enlightenment Britain. It was cited in several parliamentary debates over the corn laws in Britain and in debates in the US Congress. The book remained a set textbook at Cambridge well into the Victorian era.
Charles Darwin, as a student of theology, was required to read it when he did his undergraduate studies at Christ's College, but it was Paley's
Natural Theology that most impressed Darwin even though it was not a set book for undergraduates. Portraits of Paley and Darwin face each other at Christ College still today.
[7]" wiki