rejection of unified truth

فَتَقَطَّعُوٓا۟ أَمْرَهُم بَيْنَهُمْ زُبُرًا ۖ كُلُّ حِزْبٍۭ بِمَا لَدَيْهِمْ فَرِحُونَ

But they [i.e., the people] divided their religion among them into portions [i.e., sects] - each faction, in what it has, rejoicing.