It can also be pointed out that Darwin's motivations do not affect the validity of his theory. If it was true that he came up with the theory of evolution out of a desire to mislead the world and move them away from god, the theory still needed to be testable and falsifiable to be a legitimate scientific theory. If Darwin loathed god with all of his energy, he still needed to show his work and allow it to be reviewed by his peers and checked for accuracy and errors. If ID is simply creationism rebadged, it can still be put forth for scientific scrutiny via the scientific method and the system of peer-review. Motivations make for a good story, but they do not matter. Results matter.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould