Creationists often refer to the words of Darwin when he pondered the evolution of the complex eye. He said that to suppose that the complex eye evolve by natural selection seems "absurd in the highest possible degree". What they always ignore is that Darwin went right on in the very next sentence to propose how the eye could have evolved and that numerous gradations must exist between the simplest light detecting organs and the complex vertebrate eye.
This very misquote in the creation book is what flipped the switch for me from "it still could be the truth" to "it's definitely a cult." Everything I'd seen in my research (much of it on jwfacts.com) up to that point (607, child abuse, various fairly obvious doctrinal flaws, etc) I had a way to rationalize. Obviously it was all building my already substantial doubts, but seeing this misquote, followed by the statement that scientists still hadn't resolved the problem (when Darwin himself did in the very next sentence) I couldn't rationalize away as anything other than an outright lie, staring at me in black and white.
The cult (and indeed all religions) would do well to invest their time in rationalizing how their religious tradition is still significant in the light of the fact of evolution and other scientific facts than spreading outright lies that are so easily exposed as this one.