I believe there are very few true atheist because the belief in absolutely nothing is not conducive to, nor an example of, intelligence. It is a however a trait that psychopaths and sociopaths tend to share and many of them score quite high on IQ test, but their social skills and table manners tend to be terrible.
Many atheists are obviously actual believers who resent and hate God. A true atheist would not try to force his particular view on others because others’ views should not matter at all to him unless others are trying to actually coerce him into expressing theist views. Of course not all atheists fall into this category, perhaps most do not but the nature of it is that most who do not will not become known and thus not be counted. The atheists we are familiar with are the screamers who insist that all of us must be protected from any sort of God.