Darwin merely found evidence to support what many people were already coming to believe at the time. And litteraly 10's of thousands of scientists have re-verified ever since.
There's an old saying about conspiracies, that any with more than one conspirator are bound to be discovered. If Darwin was a calculating fraud, then his conspiracy has been the most successful the earth has ever seen.
This list of 10's of thousands of 're'verifications only apply within a narrow scope of like biological "kinds" (genus/species). I don't know any ID/creationist scientist that disagree with these theories when applied narrowly. It's when scientists attempt to mold micro-evolutionary observations to macro-evolutionary assumptions that I dissent. Not just because some of it flies in the face of my belief that Genesis is accurate but because nothing used as macro-evolutionary "proof" proves anything of the sort.
I hadn't thought of it this way but you may not be far off by saying, "...his conspiracy has been the most successful the earth has ever seen." (though I doubt he had the foresight or intent to do so)