The main social function of referring to things as "magic" is to explain what we do not understand and, therefore, what we are likely to fear. There are any number of historical examples involving hysteria over witches and wizards started by people very much like the Dursleys. The Puritans of Salem in 1692 were very much the same type of suspicious zealots and were also motivated largely by fear of the unknown.
Explanation:
Make this your own don't copy every word. Change the words and use Spinbot to make in yours.
The author wants to show that even though the Monkey King thinks he is an important ruler and is equal to the others, the other deities just consider him a monkey (and he might not be as important as he thinks he is).