There are many things that cause hallucinations...it is common in Schizophrenia, but it doesn't mean that a person who is experiencing hallucinatory phenomenon has Schizophrenia.
There are many non-psychotic people experiencing hallucinations that do not need serious medical intervention. Those who can identify triggers, and who understand that what they are hearing and seeing is just a product of their mind, are usually healthy individuals. You would be surprised at the amount of people and young children who experience non-psychotic hallucinations.
Schizophrenia is a thought processing disorder. If you are well enough to comprehend the fact that your hallucinations are not real, you very likely do not have schizophrenia.
There is a strong link between vitamin B12 and schizophrenia an other brain issues. There might be an absorption issue (lack of intrinsic factor in the stomach). sublingual B12 can be tried (you can't overdose on it) just to see if it makes a difference. Perhpas read the book called "Could it be B12?"
You comment does offend me. And since you asked for an explanation why someone would be offended, this is it;
There is a reason, when someone breaks their leg, they go to a medical professional rather than a priest. Just like your family doctor has been educated and trained to heal a fractured bone, a psychologist has been educated and trained to heal a fractured mind.
Certain priests might have some psychological training, sure, but ultimately if someone is religious I'm sure they will seek the advice of their own priest/elder/whatever on their own. They don't need advice in a medical forum to do that. It's not helpful.
-----------------------------------------------------------------------------------------
To the OP:
Hearing (external) voices is usually associated with schizophrenia, however, in a child that young, it's hard to say whether it's external or internal voices, as others have said. Plus, also as others have already said, schizophrenia usually doesn't manifest until teen years, so it would be unlikely if that were it, though not impossible. I would suggest getting him to a qualified child psychologist as soon as possible.
Having had a daughter, a husband and a mother in law with bipolar disorder please please please get your son checked and don't let them tell you he is too young. Audio hallucinations can occur with untreated bipolar and current research shows that children can have bipolar disorder. My daughter is 30 and is a hopeless drug addict - and part of the reason is because doctors and psychiatrists ignored my pleas to test her for bipolar disorder. Saying a prayer!!!
People my report my comments that is fine with me I only have suggestions but if my comments offend you so much explain why? What is the reason that this offend you so much to suggest something that may help? Society is so saturated with information and suggestion I know anything religious is stayed away from but I will say what is true im not forcing my views only suggestions..i hope that the individuals get the help they need but know this I will never be ashamed of the name of JESUS . And his name is able to come againt every negative thought or voice or sickness or illness..the name is powerful. Also doctors are a blessing to help up too. I hope you receive the help you need ..sighning off
Again you may not take my suggestion but just think about it. This is a situation that you have little control over because the voices is in the child head. You may not be religious but you can think on it. Tell the child to say JESUS when he hear the voices tell him to do bad things tell him to say over an over until the voices stop. Ask him if the voices stop. Get the child the additional help he needs