The truth is that God is all around us. In Him we live and move and have our being. Why do we as individuals, and as a society, keep acting as if God is absent from our lives?
Someone utters the name “Jesus Christ” as a curse and no one acts embarrassed. If someone uttered your name as a curse when you were present wouldn’t you think others present would be embarrassed?
The answer to the question in the title is that we keep suppressing the truth because we want to keep doing whatever we want to do instead of living for God. It’s time to change.