11:119
إِلَّا مَن رَّحِمَ رَبُّكَ ۚ وَلِذَٰلِكَ خَلَقَهُمْ ۗ وَتَمَّتْ كَلِمَةُ رَبِّكَ لَأَمْلَأَنَّ جَهَنَّمَ مِنَ ٱلْجِنَّةِ وَٱلنَّاسِ أَجْمَعِينَ
Except whom your Lord has given mercy, and for that He created them. But the word of your Lord is to be fulfilled that, "I will surely fill Hell with jinn and men all together."
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Allah has not made Faith universally accepted
Allah, the Exalted, informs that He is able to make all of mankind one nation upon belief, or disbelief. This is just as He said,
وَلَوْ شَآءَ رَبُّكَ لآمَنَ مَن فِى الاٌّرْضِ كُلُّهُمْ جَمِيعًا
(And had your Lord willed, those on earth would have believed, all of them together.) 10:99 Allah goes on to say,
وَلاَ يَزَالُونَ مُخْتَلِفِينَإِلاَّ مَن رَّحِمَ رَبُّكَ
(but they will not cease to disagree. Except him on whom your Lord has bestowed His mercy,) This means that people will always differ in religions, creeds, beliefs, opinions and sects. Concerning Allah's statement,