Atheist morality is whatever the majority (or the dictator) feel at the moment. There is no God given natural law, obviously, and contrary to the atheist accusation that religion kills people, I give you atheism killing far more on the historical spectrum. In the 20th century, the atheistic totalitarian states killed far more numbers than all the religious wars combined.
Nazism was a race worshiping pagan ideology that despised religion, indeed, Hitler hoped to hang the Pope as soon as he could. Over 50 million dead from their ideas.
Communism - from the Ukrainian genocide to the murders of Mao to the killing fields of Cambodia and Vietnam, communism was completely devoid of any morality and easily ascribed “good” to their own heinous actions. They killed millions upon millions, all the while stamping out any vestiges of the ‘opiate the people’. Hitchens was once a commie, or at least didn’t complain about wearing their course underwear, and he may have seen the errors of his ways but not completely. They are abundant murders and only one living in a self created moral universe could even tolerate them.
America today is now responsible for 50MM abortions. Many of these woman regret it and return to their religious faith for renewal. The culture of death resides with the removal of all aspects of religion from the village square, and those purveyors of atheism now seek to penalize people that openly profess their faith.
One should not be allowed to define their own morality - it allows one to walk proudly after committing mass murder!