The concept that some biological features are too complex, too precise, or too specific to have been created by any other force than an intelligent designer is intellectual laziness. Evoking a designer is the null solution—it answers everything, and thus answers nothing. Disease, mental illness, lightning, and earthquakes can all be explained by a “designer,” but there are better answers worth pursuing, waiting for us to find them. Science is that pursuit. Anything else is faith, and no matter how positive or well-intentioned, faith is not an excuse to live in ignorance.
Science does not have all the answers. There are many questions that science has not yet answered. But that does not mean that science is flawed or that there are answers out of its reach. Rather, science is a process, a means of studying and describing the universe. Science also represents a body of knowledge that is always growing and being amended and corrected as progress is made. Science takes time and patience, resources and dedication. In short, good science is hard work.
Like other well-proved theories, evolution is good science backed by decades of observation, testing, and refinement. Intelligent design is not.