I became an atheist in about a day. My whole foundation of belief was:
1. Evolution is false so god is real.
2. The bible is true so Christianity is true
3. JW have the true Christianity.
So when evidence came to me disturbing #2 I was purplexed for awhile trying to firgue out how to deal with it but decided to go to the basicsstep 1 I went on the internet and looked for 100% proof of evoloution. I decided if I couldn't find 100% proof or if their were holes in the logic I would close my mind to what i had discovered.
After ERVs and Chromosome 2 were discovered on the internet that evening and tracing all the evidence for them I rejected God and the bible that night. No question.