"So that is Allah, your Lord, the Truth. And what can be beyond the truth except error?" Meaning: your idols are error and falsehood. "So how are you averted?" Meaning: how are your minds diverted so that you worship other than Him?!
﴿فَذَلِكُمُ اللَّهُ رَبُّكُمُ الْحَقُّ فَمَاذَا بعد الْحق إِلَّا الضلال﴾ يَعْنِي: أَنَّ أَوْثَانَكُمْ ضلالٌ وباطلٌ ﴿فَأنى تصرفون﴾ فَكَيْفَ تُصْرَفُ عُقُولُكُمْ فَتَعْبُدُونَ غَيْرَهُ؟!