Cleanthes' argument from design for God's existence is not convincing. He compares two different ideas and thus, wrongly generalizes. He also commits a fallacy, and doesn’t meet the criteria necessary for the type of argument he offers. Although, a few potential strong points are present in his beliefs, like the improbability of chance, and the incomprehensible evidence of God, they are still not strong enough for His justification.
Cleanthes through an a posteriori, inductive argument claims that since the presence of small machines (i.e. houses) implies human design, the presence of an even bigger machine (i.e. the universe) implies a human-like intelligence behind it as well as "the adapting of means to ends in natural and human machines…