Ash Shuraa Ayah 8

وَلَوْ شَآءَ ٱللَّهُ لَجَعَلَهُمْ أُمَّةً وَٲحِدَةً وَلَـٰكِن يُدْخِلُ مَن يَشَآءُ فِى رَحْمَتِهِۦ‌ۚ وَٱلظَّـٰلِمُونَ مَا لَهُم مِّن وَلِىٍّ وَلَا نَصِيرٍ ٨ Had Allah willed, He could have easily made all ?humanity? into a single community ?of believers?. But He admits into His mercy whoever He wills. And the wrongdoers will have no protector or helper.