Blasphemy Day is observed worldwide every September 30 and aims to encourage individuals to freely express criticism of religion and oppose blasphemy laws that exist in various countries. Founded in 2009 by the Center for Inquiry (CFI), a nonprofit organization based in Amherst, New York, the day commemorates the anniversary of the publication of the controversial Muhammad cartoons by the Danish newspaper Jyllands-Posten in 2005, which sparked significant protests in Islamic nations. The observance promotes the belief that religious beliefs should be open to examination and critique, asserting that everyone has the right to express disdain for religion. Participants engage in discussions and activities that challenge the taboo surrounding religious criticism, while the CFI emphasizes fostering a secular society based on reason and humanist values.