Why does Nietzsche think religion and democracy fall under slave morality?

Nietzsche argues that both religion and democracy embody "slave morality" because they prioritize values such as humility, empathy, and equality, which he sees as reactive responses to the dominant "master morality" of the powerful and noble. He believes that these systems promote mediocrity and suppress individual Excellence by glorifying weakness and subservience. Consequently, they undermine the potential for human greatness and creativity, favoring conformity over individuality. In Nietzsche's view, this moral framework stifles the flourishing of the exceptional individual, which he champions.