State atheism is the official promotion of atheism by a government, sometimes combined with active suppression of religious freedom and practice.
Violence committed by secular governments and people, including the anti-religious, have been documented including some instances of violence or persecutions focused on religious believers and those who believe in the supernatural.
USSR anti-religious campaign (1921–1928) among many others documented, look them up.
Political ideology – Religious ideology – Secularism
Which do you pick since all three have been responsible for war and death in large numbers.