Final answer:
Karl Marx critiqued religion for maintaining social inequality and creating a false sense of happiness, encouraging conformity instead of resistance to capitalist exploitation.
Step-by-step explanation:
Karl Marx was critical of religion because he saw it as a tool that perpetuated the status quo and maintained social inequality. He posited that religion serves as the 'opium of the people', providing an illusion of happiness that helps the working class cope with economic suffering without challenging the capitalist structures that led to their predicament.
Marx argued that religion encouraged people to focus on an afterlife, promoting obedience and conformity, which in turn discouraged them from seeking socioeconomic improvements in their current lives.