Read and reflect on verse 3492 from Surah Luqman: But as for him who is bent on denying the truth - let not his denial grieve thee: unto Us they must return, and then We shall make them [truly] unders...
وَمَنْ كَفَرَ فَلَا يَحْزُنْكَ كُفْرُهُ ۚ إِلَيْنَا مَرْجِعُهُمْ فَنُنَبِّئُهُمْ بِمَا عَمِلُوا ۚ إِنَّ اللَّهَ عَلِيمٌ بِذَاتِ الصُّدُورِ
But as for him who is bent on denying the truth - let not his denial grieve thee: unto Us they must return, and then We shall make them [truly] understand all that they were doing [in life]: for, verily, God has full knowledge of what is in the hearts [of men].