What a load of codswallop. I know many atheists who adhere to individual freedom, smaller government and conservative values.
Certainly, like all generalizations, this generalization is not ALWAYS true.
However, note that Communist countries ALL tend to be atheistic and socialistic. China may try to become more capitalistic but the USSR couldn't pull it off and I doubt that China will be able to pull it off either.
Also as Europe has become more socialistic, they have become more atheistic.
In America, over 70 percent of those who never attend church vote Democrat and over 65 percent of those who go to church at least once a week, vote Republican. The Democrat Party has always been more sympathetic to communism and socialism than Republicans.
Libertarians would be the exception to the rule.