وَلَوْ شَاءَ اللَّهُ لَجَعَلَهُمْ أُمَّةً وَاحِدَةً وَلَٰكِنْ يُدْخِلُ مَنْ يَشَاءُ فِي رَحْمَتِهِ ۚ وَالظَّالِمُونَ مَا لَهُمْ مِنْ وَلِيٍّ وَلَا نَصِيرٍ

Surah Ash-Shura : 8
And if Allah willed, He could have made them [of] one religion, but He admits whom He wills into His mercy. And the wrongdoers have not any protector or helper.

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