How do we know that untruthful witnesses are a problem in Christianity?

In the sermon, the preacher emphasizes that untruthful witnesses are not merely deceived but knowingly misrepresent the nature of God and His gospel. Romans 1:21 states that they know God yet refuse to glorify Him, showing a complete disregard for truth and justice. Ungodly witnesses actively spread false narratives, presenting doctrines that exalt human effort over divine sovereignty, which leads to spiritual deception within the church.
This issue is critical for Christians, as it highlights the continuous battle against false teachings that often permeate religious systems. When individuals misrepresent God’s plan of salvation as dependent on human choice rather than divine grace, the integrity of the gospel is compromised. Therefore, recognizing and responding to these ungodly witnesses becomes essential for faithful witness and biblical clarity in the church.