Agnosticism is a belief that it isn't possible to know for sure if God exists or not. People who believe in agnosticism think that we can't know if God exists because we can't see or hear God and it's impossible to know if there is a God without having proof that shows God exists. A lot of agnostics don't attend any type of religious services or take part in religious practices and traditions but they aren't sure if it's true or not and don't have a way to find out.