Messenger of Allah ﷺ was asked about the children of (Mushrikeen) pagans. The Prophet ﷺ replied, "Since Allah created them, He knows what sort of deeds they would have done."  

سُئِلَ رَسُولُ اللَّهِ ﷺ عَنْ أَوْلاَدِ الْمُشْرِكِينَ فَقَالَ اللَّهُ إِذْ خَلَقَهُمْ أَعْلَمُ بِمَا كَانُوا عَامِلِينَ  

The Prophet ﷺ was asked about the offspring of pagans (Mushrikeen); so he said, "Allah knows what sort of deeds they would have done."  

أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ؓ يَقُولُ سُئِلَ النَّبِيُّ ﷺ عَنْ ذَرَارِيِّ الْمُشْرِكِينَ فَقَالَ اللَّهُ أَعْلَمُ بِمَا كَانُوا عَامِلِينَ  

The Prophet ﷺ said, "Every child is born with a true faith of Islam (i.e. to worship none but Allah Alone) and his parents convert him to Judaism or Christianity or Magianism, as an animal delivers a perfect baby animal. Do you find it mutilated?"  

قَالَ النَّبِيُّ ﷺ كُلُّ مَوْلُودٍ يُولَدُ عَلَى الْفِطْرَةِ فَأَبَوَاهُ يُهَوِّدَانِهِ أَوْ يُنَصِّرَانِهِ أَوْ يُمَجِّسَانِهِ كَمَثَلِ الْبَهِيمَةِ تُنْتَجُ الْبَهِيمَةَ هَلْ تَرَى فِيهَا جَدْعَاءَ