God knows full well that whatever they worship besides Him are really nothing. He is the Almighty, the Most Wise.
إِنَّ اللَّهَ يَعلَمُ ما يَدعونَ مِن دونِهِ مِن شَىءٍ وَهُوَ العَزيزُ الحَكيمُ
innal laaha ya’lamu maa yad’oona min doonihee min shai’; wa Huwal ‘Azeezul Hakeem