don't get bent and insulted because you are an atheist. Marx said religion stood in the way of communism. He felt people wouldn't move towards communism because religion softened their pain. The famous quote from Marx was "Religion is the opium of the people"

wiki-

Marx was making a structural-functionalist argument about religion, and particularly about organized religion.[3][4] Marx believed that religion had certain practical functions in society that were similar to the function of opium in a sick or injured person: it reduced people's immediate suffering and provided them with pleasant illusions which gave them the strength to carry on. Marx also saw religion as harmful to his revolutionary goals, as it prevents people from seeing the class structure and oppression around them, thus religion can prevent the socialist revolution.

blm and antifa have embraced this and are actively working against religious groups.