Back then, the believers were sitting ducks, living on deltas of rivers and fertile plains.

The unbelievers didnt settled down. They were the enemies, raiders of that period.

They were like that also because they didnt believed. Since they didnt believed, they

If they believed they would be worthy of this world and would be able to live in other areas other than "mountains, deserves, dens and caves".

Everything revolves around faith. Not reason. Thats the whole design. Thats the whole point why Jews consider Isaac, while the muslim consider Ishmail the first born.

See, its a direct attempt to hurt one of the core examples of faith in the doctrine. Abraham faith being tested.