https://enduringword.com/bible-commentary/1-john-2/

C. An attack on our relationship with God: worldliness.

1. (15) The problem of worldliness.
   Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him.

a. Do not love the world: John has told us that if we walk in sin’s darkness and claim to be in fellowship with God, we are lying (1 John 1:6). Now John points out a specific area of sin that especially threatens our fellowship with God: worldliness, to love the world.

b. Do not love the world or the things in the world: The world, in the sense John means it here, is not the global earth. Nor is it the mass of humanity, which God Himself loves (John 3:16). Instead it is the community of sinful humanity that is united in rebellion against God.

i. One of the first examples of this idea of the world in the Bible helps us to understand this point. Genesis 11 speaks of human society’s united rebellion against God at the tower of Babel. At the tower of Babel, there was an anti-God leader of humanity (whose name was Nimrod). There was organized rebellion against God (in disobeying the command to disperse over the whole earth). There was direct distrust of God’s word and promise (in building what was probably a water-safe tower to protect against a future flood from heaven).

ii. The whole story of the tower of Babel also shows us another fundamental fact about the world system. The world’s progress, technology, government, and organization can make man better off, but not better. Because we like being better off, it is easy to fall in love with the world.