By claiming only matter is real, he is technically oppressing people who believe in religion, which includes people in the working class. If you want me to go deeper, let me know. Also, by claiming religion is a drug, this means he is saying that belief in religion is wrong. Christianity supports many things, such as honoring your parents and not killing people. This means that he is unjust, and if he could, would most likely force people to not have beliefs. By doing so, he is oppressing the people who believe in Christianity and other religions, which includes people in the working class.
