"For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth."
Romans 1:18 ESV
This verse is most commonly used to correctly justify why athiests refuse to acknowledge that God is real.
When one does not want to believe something, it is natural for that one to 'suppress' the truth.
As mankind has inherited their sin nature and a desparately wicked heart from Adam, man naturally also suppresses the truth about the Gospel of Jesus Christ as it forces man to recognise their wickedness and pending judgement due to violating the laws of a holy God.
As Christians, this verse applies to us also in the sense that we can also suppress the truth if we choose to. We are caught in spiritual battles every day where our spirit wages war against the flesh and vice-versa. Our flesh will still be inclined to make excuses and justify reasons for sin. Many times, our flesh attempts to deceive us by thinking we are not making excuses.
For example, a Christian who needs to learn to be patient can suppress the truth by saying things like "I had a good reason to not be patient that time" or "I was patient during that interaction" (when they weren't). These actions lead to spiritual downfall and stunts spiritual growth if it is not addressed.
Christian, let us remind ourselves to remain vigilant whilst in our daily battles acknowledging that we continually need God's grace. Our flesh will be inclined to not acknowledge certain truths of the bible. Let us counter that by looking to the Word and be diligent with prayer so that our sanctification process may not hindered.