Not sure if you are aware, but "neutral" atheistic governments killed close to 80,000,000 people during the 20th century:
Mao Ze-Dong (China, 1958-61 and 1966-69, Tibet 1949-50) 49-78,000,00 people murdered
Jozef Stalin (USSR 1932-39 only) 15,000,000 people murdered
Pol Pot (Cambodia, 1975-79) 1,700,000 people murdered
Kim II Sung (North Korea 1948-94) 1.6 million people murdered
Tito (Yugoslavia 1945-1987) 570,000 people murdered
Suharto (Communists 1967-66) 500,000 people murdered
Ante Pavelic (Croatia 1941-45) 359,000 people murdered
Ho Chi Min (Vietnam 1953-56) 200,000 people murdered
Vladimir Ilich Lenin (USSR, 1917-20) 30,000 people murdered