How do we know the doctrine of God's exclusivity is true?

The doctrine of God's exclusivity is rooted in the biblical revelation of His character. In Exodus 20:3, God reveals that He is a jealous God, longing for His people's undivided allegiance. This command, framed within the historical context of Israel's deliverance from Egypt, underscores His authority as their Creator and covenant Keeper. Moreover, throughout Scripture, from the Old Testament to the New, God consistently asserts His oneness and sovereignty, thereby confirming that the worship of any other entity is incompatible with genuine faith in Him. Jesus reinforces this doctrine by emphasizing the greatest commandment: to love the Lord your God with all your heart, soul, and mind (Matthew 22:36-38), further solidifying the demand for exclusive devotion.