Blasphemy is a word that means speaking badly about a religion, or insulting a god. Some religions see blasphemy as a religious crime. Many countries witha state religion have laws that make blasphemy a crime. For example, blasphemy can be punished with the death penalty in Saudi Arabia or Pakistan. In other countries, the punishment for the crime is a fine, or imprisonment.
The United States, Canada, and many European countries, have laws to protect people who speak badly about religion. Sometimes people do this in a satirical way, like with a movie that makes fun of a religion. In these countries, profanity is often protected by freedom of speech as well.