All of nature displays purpose. A bird’s wings serve a purpose. Chlorophyll serves a purpose. Our immune system serves a purpose. Purpose implies intent. How can intent exist without intelligence? Case closed.
Complexity and design also show intelligence behind it.
The idea that randomness can on occasion produce results that look like order is a failed argument because it can happen on a simple level, like I’ll give them the structure of crystals, for example, that is incredibly simple. It does not even begin to rise to the level of complexity of the smallest single celled microbe.
And there’s more to it than that. Science cannot explain what the difference is between a living human being and a dead body and why when a person dies, decay happens so quickly. Entropy is a strong part of the universe.
For entropy to be overcome to such a degree as we’ve seen requires work to be put into the system. It simply cannot happen as a result of random occurrence for so long a time.