The danger of collective disbelief (kufr) leading to spiritual ruin

وَلَوْلَآ أَن يَكُونَ ٱلنَّاسُ أُمَّةً وَٰحِدَةً لَّجَعَلْنَا لِمَن يَكْفُرُ بِٱلرَّحْمَـٰنِ لِبُيُوتِهِمْ سُقُفًا مِّن فِضَّةٍ وَمَعَارِجَ عَلَيْهَا يَظْهَرُونَ

And if it were not that the people would become one community [of disbelievers], We would have made for those who disbelieve in the Most Merciful - for their houses - ceilings and stairways of silver upon which to mount.