its not a dillusion....Quran talked about this Quom The Sabbath Breakers in Surah An-Nisa
You are refering to the ayah "koonu Qiradatan Khaase-een" ??
So, you are saying since people (jewish tribe) were converted to monkeys, therefore, humans have monkeys as their ancestor?
Did you read further down and realize that none of them survived after the punishment?