It points to the apparent intelligence in the workings of nature to infer the existence of an intelligent Creator. Proponents of this view usually rely on probabilistic arguments to show that the chance of intelligent design by the way of random processes is exceedingly small. Therefore there must be an all-powerful intelligent being who put everything together. This argument is conceptually simple and has certain psychological appeal. David Hume explains the order of the universe by attributing the intricate arrangements to the innate organizing principles in matter.
Atheists now understand that the law of probability is against evolution.
They shift the burden of proof by reiterating that the universe exists because we are here to observe it. There are many possible universes which are probabilistically unfavorable and do not exist. But this universe happens to exist and we happen to be here to observe it. The anthropic principle tells us that we are not justified to question the unlikelihood of our existence or to speculate the existence of an intelligent Creator. Beside the classical arguments such as the ontological, cosmological, teleological and moral arguments, there is the Pascal wager argument from the modern period.