Religion: A system of supernatural beliefs and worship that helps people form a
community.
Superstition: An irrational supernatural belief based on fear. Catholicism says it shows an undignified attitude to God and encourages fear in yourself and maybe others too.
Fundamentalism: A religion or ideology that claims it knows its opinions are true. All attempts to force your will on others are necessarily based on the idea, “I know I’m right. So I cannot tolerate you doing differently from what I say.”
Extremism: Being willing to hurt people seriously for religious or superstitious reasons. Not all fundamentalists are extremists but there can be no extremism without fundamentalism.