The advancedatheist takes issue with the relationship between atheism and nihilism:
Nihilism is not an atheist belief. Nihilism is a Christian belief about atheism. Notice the difference.
According to the GSS, atheists are four times as likely as firm theists to definitively agree that “life serves no purpose”. The percentages are small though, 8% and 2%, respectively. Fortunately the survey asked the question on a five-point scale, so it’s easy enough to create an index by both theistic orientation and religious service attendance. To avoid racial confounding, responses are restricted to whites:
To put it into political terms, most Democrats aren’t Marxists, but Democrats are more likely than Republicans to be Marxists. Likewise, most atheists aren’t nihilists, but atheists are more likely than theists to be nihilists.
GSS variables used: NIHILIST(1,2,3,4,5), GOD(1)(2)(3-5)(6), ATTEND(0)(1-2)(3-4)(5-6)(7-8), RACE(1)