Romans 3:5-6

But if our unrighteousness brings out God's righteousness more clearly, what shall we say? That God is unjust in bringing his wrath on us? (I am using a human argument.) Certainly not! If that were so, how could God judge the world?

But if our unrighteousness brings out God's righteousness more clearly
Romans 5:8 But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.

(I am using a human argument)
Romans 6:19 I put this in human terms because you are weak in your natural selves. Just as you used to offer the parts of your body in slavery to impurity and to ever-increasing wickedness, so now offer them in slavery to righteousness leading to holiness.
Galatians 3:15 Brothers, let me take an example from everyday life. Just as no one can set aside or add to a human covenant that has been duly established, so it is in this case.

If that were so, how could God judge the world?
Genesis 18:25 "Far be it from you to do such a thing--to kill the righteous with the wicked, treating the righteous and the wicked alike. Far be it from you! Will not the Judge of all the earth do right?"
Romans 2:16 This will take place on the day when God will judge men's secrets through Jesus Christ, as my gospel declares.
Romans 3:19-20 Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world held accountable to God. Therefore no one will be declared righteous in his sight by observing the law; rather through the law we become conscious of sin.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.