We have over proof. It’s the Qur’an. As a matter fact the Qur’an is written in such authority and confidence that it place a challenge to people such as you. It is stated that for those who does not think it’s a book from any other than God, then produce just one chapter like it.
Please bear in mind the Qur’an was revealed and written in classical Arabic and is still available for anyone to try and imitate. So go ahead give it a try.