Creation is enough to tell that there is a Creator. The reason that the Bible is written is for Salvation.
When Paul says in 2 Corinthians 2:2, “For I decided to know nothing among you except Jesus Christ and him crucified.” He is saying, the gospel is the theme of the whole Bible. The gospel is the content of Expository Preaching, yet, Jesus is the content of the gospel.
Expository mean to explain the biblical texts. Preaching means to proclaim the biblical gospel. Expository Preaching is to preach the gospel by explaining the texts. The gospel is not just information. The gospel calls to action. In Acts 2:36-37, after Peter had preached about Jesus, the people were “cut to the heart” and asked for what to do, Peter said to them, “Repent!”
“Without explanation it is not expository; without application it is not preaching.” — Steven Lawson