While I think I see why the parent was downvoted, I would add that in my experience atheism doesn't correlate very strongly with rationality, insofar as rationaltiy can be said to mean anything. I know plenty of successful scientists who are Christian. I know plenty of atheists who repeatedly make poor life choices. Telling me someone is religious does not help me predict whether I will be able to beat them on any practical contest of wits or reasoning.

The majority of Chinese I have encountered both inside and outside of China believe in traditional Chinese medicine, including the healing powers of chi and all the other aspects that are no better than homeopathy. Of course all of these individuals have claimed to be atheists. There are many flavors of systematic irrationality.