Censorship by religion means that certain people, usually leaders or members of a religious group, decide what can and cannot be said or shown to others based on their religious beliefs. This can happen in different ways. Sometimes, religious groups may ask people to not say certain things or wear certain clothes that they believe are disrespectful to their religion. Other times, they might try to ban books, movies, or music that they think goes against their beliefs.
For example, some religions might not like it when people swear or use bad language, so they might ask others to not do that around them. Others might not want people to show too much skin in public, and so they might ask others to cover up more. Some religious groups might not want people to read certain books or watch movies with certain themes, like violence or sex.
Censorship by religion can be concerning because it can limit people's freedom of expression and the ability to access information. Additionally, it can create conflict between people with different religious beliefs. It's important to try to balance respect for religious beliefs with the rights of individuals to have their own beliefs and express themselves in appropriate ways.