- The original leftists, the French revolutionaries, were immensely anti-clerical and opposed to the Catholic Church. They carried out one of the world's first modern de-Christianization campaigns.
- The leftist regime of Plutarcho Elias Calles led a great pro-secular, anti-clerical campaign against the Catholic Church in Mexico.
- The leftist Young Turks and later Kemalists of Turkey promoted secularism, created a progressive republican nation-state, and abolished the Caliphate. They banned the hijab from public places and greatly promoted women's rights.
- The Bolsheviks stomped Islam out of public life in Central Asia, and gave unprecedented rights and freedom to Central Asian women.
- The Soviets fought to support the socialist government in Afghanistan and uphold civilization and progress against the uncivilized and backwards Islamists. After the Soviets withdrew and the Taliban established their dominance by the mid-90s, Afghanistan was plunged into a regressive, barbaric, quasi-medieval state of hellish proportions.
- In my own country of Telangana, Communists organized a great peasant rebellion in the 1940s against oppressive landlords and the Islamic state of Hyderabad.
This is just a small list, and can probably be extended easily. Given this glorious history of fighting against religious barbarism and backwardness on all continents of the globe, are modern leftists too pusillanimous with regards to Islam? Have leftists forgotten what it means to be a leftist?