Okay kiddo, so Islam is a religion that many people around the world follow. One thing that is really important in Islam is not disrespecting or saying bad things about prophets, holy books, or God. This is called blasphemy.
In Islam, since these things are very special to people who follow the religion, saying anything bad about them can be really hurtful and disrespectful. That's why it's considered very wrong to do so.
If someone does commit blasphemy, it can be seen as a big problem in the eyes of the Islamic community. Even in some countries, it's punishable by law!
But it's important to remember that people have the right to their own beliefs and opinions. So while it's not a good idea to insult or disrespect something that others care about a lot, it's also important to be kind and respectful to all people, no matter what they believe in.