So can other things. You need to nail it down to ID being the cause, otherwise you're just making obvious general statements.
Therefore to infer intelligent design as present and operative throughout the universe is to indulge a reasonable explanation, or theory.
Only in the vernacular definition of theory, as in your personal guess or belief. I can respect the statement in that category, but not as science.
No more than evos need to nail down some other cause. The theory of evolutioon is a general statement supporting the evidence at hand. It makes "obvious general statements" in view of the givens with which its proponents operate.