Theists often claim that the complexities of nature and the tiny details that allow human life to exist are evidence of god, as nothing so intricate and unlikely could happen without a designer. I believe that this is not the case as the universe is infinitely massive, and there are thousands, probably even millions of different planets. Logically, it is inevitable that at least one of those randomly created planets would have the required characteristics for life to survive. Can anybody provide a convincing counter argument to this?

Actually the universe is not infinite, although it is extremely large. Your claim that "it is inevitable that at least one of the millions of planets has the required characteristic for life" is not a logical claim (it is not true because it follows the laws of logic); it is an empirical claim and depends crucially on the likelihood of (a) a suitable planet and (b) suitable evolution on that planet. We don't yet know how likely or unlikely the evolution of life is, because our understanding of evolution, and life, is paltry. Intelligent design theorists take advantage of this ignorance to argue that a designer was necessary for the wonderful yet highly improbable complexity of life. But in fact we do not know how (un)likely life is in this universe or how a designer might work in the universe.

Actually the universe is not infinite, although it is extremely large. Your claim that "it is inevitable that at least one of the millions of planets has the required characteristic for life" is not a logical claim (it is not true because it follows the laws of logic); it is an empirical claim and depends crucially on the likelihood of (a) a suitable planet and (b) suitable evolution on that planet. We don't yet know how likely or unlikely the evolution of life is, because our understanding of evolution, and life, is paltry. Intelligent design theorists take advantage of this ignorance to argue that a designer was necessary for the wonderful yet highly improbable complexity of life. But in fact we do not know how (un)likely life is in this universe or how a designer might work in the universe.

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