What does the Bible say about preaching the gospel from scratch?

In Acts 17, the Apostle Paul demonstrates how to preach the gospel to people who know nothing about the God of the Bible. He begins by acknowledging the Athenians' religious nature, referring to their altar to an unknown God. Paul uses this opportunity to declare the true God who created everything and does not dwell in temples made by human hands. This method showcases how to engage with a culture steeped in idolatry, starting from the foundational truth that God is the Creator, seeking to convey His righteousness and the need for repentance through faith in Christ.