Worldliness is whatever any culture does to make sin seem normal and righteousness to be strange. When we embrace the Zeitgeist (the spirit of the age) of worldliness, it feels strange to think like a Christian. Acting according to the Bible’s mandates becomes difficult. 

When we think the world’s thoughts after it, our actions align with worldly patterns. We will not be motivated to do the things that God wants us to do. Instead, we will only feel comfortable acting in a manner that fits into the world’s way of doing things. 

Christians who stop attending church start to feel more comfortable in the world. Simultaneously, they feel less comfortable in the church. For the same reason, this is why regular attendance at church is so important. 

At church, we worship by hearing God’s Word, praising God, and praying. We also partake of the Lord’s Supper and fellowship together. These acts encourage believers. They convince us that we are the ones who are truly normal. They show that the world is strange before God’s eyes. 

Believers need to encourage one another. From the biblical perspective, it is normal for God’s people to show Christ and his behavior. They should not mirror the world’s behavior.

—adapted from Gregory K. Beale, We Become What We Worship: A Biblical Theology of Idolatry, 300