Intelligent design "theory" is neither faith nor science, but a malformed hybrid mutant that betrays both.
That said, I believe in intelligent design. I believe that all of creation was fashioned by God's hands, and that with the eyes of faith we can see the subtle imprint of God's touch in the world around us.
But intelligent design is not a scientific theory. Theories are assertions that are tested against the proofs of empirical evidence. A theory is accepted as true--or proven false--based on whether a series of tests or evidences support it or poke it full of holes. That's the scientific method.
It is NOT the method of faith. A theory can be proven right, but it can also be proven wrong. Our faith in God as creator cannot be like that. It is unshakable. It is NOT a testable hypothesis. Faith, real faith, is not built upon the proofs of empirical evidence. It we have to argue faith from a series of mutually supportive logical proofs, then we do not have faith. As the Apostle Paul says, "Hope that is seen is not hope." As the Apostle Paul says, "We look not at what can be seen but at what cannot be seen." As the letter to the Hebrews says, "Our faith is the assurance of things hoped for, the conviction of things not seen."
What we know in faith to be true is not science, and it has no place pretending to be science.