You can't change yourself or anyone else untill you or they admit to being deluded, the function of denial is to detached you or a person from inner examination. This is due to the delusions self defensive mechanism, that will cause psychology pain to you or the person in order to protect itself.
Self preservation is the driving force of all men and women separated from God. When Adam was cast out of God's protective environment where all his needs were met he became afraid. A fear we have all inherited from him. It is because of this fear that all of us fall into the natural path of defending ourselves through devices like lying, cheating, stealing, hatred, jealousy, envy, divisiveness, contentiousness, rebellion, adultery, etc.
Those are the natural defensive mechanisms we are all doomed to walk in to one extent or another as fallen men and women of creation. But in Christ we renounce those sinful, defensive ways and return to the Father who guards us and supplies our needs so that we don't have to resort to those old sinful ways to protect ourselves and make life good. In place of our old hurtful ways are the ways of peace, love, joy, forgiveness, kindness, faithfulness, etc. They begin to flourish within us instead. The peace we have made with God through Christ gives us the confidence to walk in these new ways instead of our old hurtful ways. We spend the rest of our natural lives learning to depend on God instead of depending on our old ways to make it through life safely.
The delusion is thinking that the ways of fallen man--strife, rage, contentions, brutality, threats, lying, immorality, etc.--are the way you live safely and successfully in this life. A person must, as you say, come out of denial and renounce those old ways, find forgiveness through Christ for having walked in those old ways, and receive God's Holy Spirit to transform them into a person who is no longer deluded by the ways of the world and walks in increasing measure in the ways of God.