Therapy is the best option, especially since the child is asking for it. It sounds like the parent might need to focus more on giving love and acceptance than forcing them to delete content the parent doesn't like.

How is one to deal with strange things on the internet? Dissociative identity disorder among social media users at scepticism-inducing proportions, being 'kin' to a fictional character and feel you really are the character, believing you're the reincarnation of a historical figure, being 'otherkin' and identifying as an animal ... My preferred approach is to treat people with respect and honour reasonable requests. If someone has a strong belief that seems mildly silly to you (and examples of 'belief that can seem a bit silly' include most religions), the point to address it with them is either when they ask for your thoughts or if the belief causes them to behave in a way that hurts or seriously inconveniences you.