We all know the truth. I believe every man knows the truth. Even the ones living in the jungle, far away from our westernized world, they know the truth about God. God's wrath is revealed against all ungodliness and the unrighteousness of men, "who by their unrighteousness suppress the truth." The truth is suppress. It doesn't say they don't know the truth. This is Romans 1:18 and verse 19-20 go on to explain this even more.
"For what can be known about God is plain to them, because God has shown it to them. For His invisible attributes, namely, His eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. They are without excuse."
God shows Himself in His creation. His eternal power and divine nature are perceived in the things he made. And the scariest part of this is, "They are without excuse." We are without excuse. It is the unrighteousness and the ungodliness that reveals the wrath of the known God. And the more unrighteous, ungodly, sinful our life and life style, the more suppressed that knowledge of God is. I know when I'm not reading the Bible and studying God's word, I become lazy and apathetic in my relationship with God. And as time goes on and I get further and further into my own things, I begin to suppress the knowledge I have. I begin to suppress the knowledge of what God demands from my life as a believer.
God's wrath is not a joke. The end result of it is death eternally in Hell, where pain and suffering are going to be so far beyond what we can even imagine here. And, total separation from God is going to be void of even common grace that everyone experiences here on earth. That alone is going to be a horrible loss. We must work so hard to grow in our knowledge and relationship with God. We must work hard to help others know Him.
Praise God for the Revealing Power of His Creation.