For me it was the Neanderthals and the flood. Then when I found the quote mining as I honestly tried to study the new creation brochure I was rocked to my core. I could mentally gymnastic my way around the society not fully understanding Neanderthals, until I realized that screwed up the original sin concept. And if original sin goes then what about Jesus? If Adam and Eve are not real then Jesus goes poof. That was tough for me to digest. I stayed confused and drank too much for a year and a half. Then I owned up to the fact that I needed to confront my questions. I quit drinking. I went ahead and thought the whole Neanderthal, Adam, flood, and Jesus problem through. It just can't fit.
Then the quote mining showed me it wasn't just that the "brothers" were behind the times or needed "new light", no they were intentionally misleading people with the quote mining. What else were they misleading about? Floodgates were opened.