The article doesn’t mention atheists distrusting other atheists. The closest it gets to stating that point is when the article brings up about people with no religious affiliation distrusting atheists in general, just like the religious folks. The reasons for this are likely due to the fact that non religious people who do not identify as atheists still usually either believe in, or are open to the possibility of an afterlife or higher power, but usually accept no religious dogmas. Many of those types of people are either usually spiritual but not religious, have new age beliefs, are deists or are agnostics.
The article had also stated that people of different belief systems are likely to distrust each other too. Obviously there’s much more going on here then simply religionists believing that others are more likely to commit crime if they don’t believe in Divine punishment, which the article doesn’t really follow up on. It’s of little surprise that many religionists distrust and even hate each other, so this verifies my latter point in my opinion. I also find this odd when you consider that religious believers commit more crimes by far proportionally than secular minded people.
I find it ironic though, because I know quite a few atheists online in my email group, many being scientists, who are the biggest crusaders for pushing for the survival hypothesis to be accepted in mainstream science. Michael Roll, an atheist, is one of the biggest afterlife crusaders that I know of, and we regularly share emails. There are defintely many atheists who disagree with each other on many topics though, just like religionists and theists.