Q3. (Romans 5:6, 8) Why is it so important to embrace the truth that "Christ died for the ungodly" (5:6), ... It is an affirmation to the fact that we are saved, not because of what we have done, but because of what Christ has done for each and everyone of us. If we can grasp the truth that He died for us while we were considered to be 'ungodly' then we can know that He truly lives for us once we become 'godly'.
that "Christ died for sinners" (5:8)? It is affirmation that we are no longer considered to be 'sinners' once we are saved. Now that He lives, we now live as the 'righteous'.
According to 5:8, did Christ die for us at our best or at our worst? At our worst. Without salvation, forgiveness, righteousness, godliness, etc. we are at our very worst. Does not matter how we feel about ourselves, whether good or bad, it is about what He says about us that becomes the truth. Without Him, we are helpless (to save ourselves and make ourselves right) and hopeless human beings.
How does this give us assurance against the devil's lies about us being too bad to forgive? We can rest assure that what God says about us is truth and what the devils tries to tell us about ourselves does not matter. God says we have been made righteous with Him if we have chosen salvation through Jesus Christ. (1 Corinthians 1:30)