In this famous dialogue Philo (who reflects Hume's views on the subject) gives us the classic critique of the argument from design. In the parts reproduced here, Cleanthes (the natural theologian) states the argument and asserts, "By this argument a posteriori, and by this argument alone, do we prove at once the existence of a Deity and his similarity to human mind and intelligence." Philo replies that the argument rests on an extremely weak analogy from which we can derive no more than a guess about a deity. The dissimilarities between the universe and a human-crafted machine are too great to draw the conclusion that Cleanthes seeks. We cannot, for example, draw a conclusion about the origin of the vast universe as a whole from a fact about the origin of a tiny part of the universe (a house or a ship, for instance). Furthermore, if we try to infer the nature of a Designer from facts about the natural world and human designers, we would have to conclude that the Designer may not be infinite (because the world is finite), may not be perfect (because nature is full of imperfections), and may not be single (because it is possible that the world was made by many deities).
-According to Philo, because the universe is perfectly ordered, the existence of a deity is likely.

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Philo argues that the argument from design is based on a weak analogy and does not necessarily prove the existence of a deity, especially not one that resembles human intelligence. He points out the dissimilarities between the universe and human-made objects, suggesting that conclusions about a deity based on such an analogy are speculative at best.

In This Famous Dialogue Philo (Who Reflects Hume's Views on the Subject)