Those who choose a way of life other than the Quran end up with the situation you have shown, when it is much, much easier to work together in mutual support.
3:103 You must hold fast, all of you together, to the Bond of God and be not divided into sects. (The Bond or Rope of God is the Qur’an which is an Unbreakable Support 2:256.) Remember God’s Favour upon you when you were enemies and, almost overnight, He brought mutual affection in your hearts. Thus, you became brothers and sisters by His Grace. And recall that you were on the brink of the pit of fire, and He saved you from it. (Various tribes used to attack one another, and personal enmity plagued them.) This is how effectively God has made His messages clear for you to journey on the lighted road. [6:165, 30:31-32, Huda = Guidance = Walk the right path = Travel on a lighted road]
Age of ignorance was not eliminated when the Quran came, just given another name; Sunnah!