Romans 1:18-25 are extremely important versus to remember when witnessing to unbelievers.
18 The wrath of God is being revealed from heaven against all the godlessness and wickedness of people, who suppress the truth by their wickedness, 19 since what may be known about God is plain to them, because God has made it plain to them. 20 For since the creation of the world God’s invisible qualities—his eternal power and divine nature—have been clearly seen, being understood from what has been made, so that people are without excuse.
21 For although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened. 22 Although they claimed to be wise, they became fools 23 and exchanged the glory of the immortal God for images made to look like a mortal human being and birds and animals and reptiles.
24 Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another. 25 They exchanged the truth about God for a lie, and worshiped and served created things rather than the Creator—who is forever praised. Amen.
According to scripture, all people know God. However, they suppress this truth for their sin. However, they can’t keep the truth they know suppressed at all times. It comes out time and time again. It’s like the beach ball you push under the water. Eventually it pops back up again and you have to keep pushing it back down. The unbeliever has to keep suppressing the truth about God in order to stop the guilt they feel because of their sinful behavior and false idols.
This video is one of the most dramatic examples of suppression I’ve seen. The Word is like a mirror to show us our sin and help us to realize that we need grace. Notice in this video how Mr. McKellen smashes the mirror by ripping out the pages of the Bible that show him his sin. He then tries to justify it by saying the Bible verse is “pornographic.” You can see how impactful the Word is to Mr. McKellen and the lengths he will go to continue his suppression of the Truth.