﴿ وَمَا كَانَ ٱللَّهُ لِيُضِلَّ قَوْمًۢا بَعْدَ إِذْ هَدَىٰهُمْ حَتَّىٰ يُبَيِّنَ لَهُم مَّا يَتَّقُونَ ۚ إِنَّ ٱللَّهَ بِكُلِّ شَىْءٍ عَلِيمٌ ﴾

“And God would never-after having invited them to His guidance -condemn people for going astray ere He has made [entirely] clear unto them of what they should beware. Verily, God has full knowledge of everything.”

And God would never send a people astray after He had guided them to Islam until He had made clear to them that which they should be wary of in the way of deeds but when they are not wary of it then they deserve to be sent astray. Surely God is Knower of all things including who deserves to be sent astray or to be guided.