Religious delusion is when someone strongly believes in something related to their religion that is not real or true. It is like when you believe in a fairy tale or that unicorns are real, even though they are not. Some people believe that they are chosen by God or that God is speaking to them, even though it is not really happening. This is like when you talk to your imaginary friend, but your friend is not real. It is important to be respectful of other people's beliefs, but it is also important to understand that not everything that someone believes is real or true.