Jesus, in Matthew 5:17-20, substantiated the writings of the Old Testament; and therefore by proxy His doctrine includes what is written in Jeremiah 17:9.justbyfaith and gordon777, in the interests of defending the character of God, it needs to be pointed out that God is far from demanding perfection as has been claimed nor does he see every single person on earth as "desperately wicked" as you also claim. Jesus never once told either the crowds or is disciples that they were "desperately wicked" which makes no distinction between those who are desperately wicked and the righteous. You won't like it, but the Bible continually speaks of the righteous as real people and even names names of those who are. David wrote in the Psalms of what God does for the righteous knowing that there are some. Obviously the understanding of what the desperately wicked are and the righteous is different in the mind of God than what you are speaking of.
I can understand this as Calvinism introduced a concept of man that accuses him, without exception, of being totally depraved, which is the worst a man can be morally. A depraved person has no morals at all. This theological constructs teaches a man to be the accuser of all man (who does that sound like) and robs anyone of any credit for anything good they do. Hence we have the view of man that you both express that does not match the view of the Bible.
Let's look at the view the Bible expresses of man as a whole. Are all men desperately wicked in the eyes of God?
No and this is easy to prove because when a statement is made that insists "all A are B" one only needs one exception to prove that the statement is false.
"All Israel will mourn for him and bury him. He is the only one belonging to Jeroboam who will be buried, because he is the only one in the house of Jeroboam in whom the LORD, the God of Israel, has found anything good." God found something good in a man.
"Thus the LORD used to speak to Moses face to face, as a man speaks to his friend." Does God speak face to face to a man who is desperately wicked? No, because Jesus said "without holiness shall no man see God."
"For the eyes of the LORD run to and fro throughout the whole earth, to give strong support to those whose heart is blameless toward him." Humm, so God is looking through the world to find those whose heart is innocent towards Him. What does this tell us? Do we think God never finds such a one? If so, why bother looking?
So does God "demand perfection" as gordon777 claims? Let's look at the whole of that passage.
You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ 44But I say to you, Love your enemies and pray for those who persecute you, 45so that you may be sons of your Father who is in heaven. For he makes his sun rise on the evil and on the good, and sends rain on the just and on the unjust. 46For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? 47And if you greet only your brothers,i what more are you doing than others? Do not even the Gentiles do the same? 48You therefore must be perfect, as your heavenly Father is perfect.
The Greek word for "perfect" is also translated elsewhere as "mature." What is verse 48 referring to? It is referring to loving your enemies and praying for those who persecute you. Is this really difficult? He means, of course, doing good to those who act like your enemies. I live in Europe and am still impressed with how the Americans spent money building up the country there was literally their enemies in war when it was over. This did not occur after WWI which the winners deeply punished the losers financially. They did not love their enemies. After WWII, they did. And these are not Christian people in particular. I have seen atheists do good to those who might not be their enemies, they certainly made their life difficult. I have seen atheists give a birthday present to a coworker who made their work very difficult. So what is Jesus saying? He is telling us in this matter of how we treat those who treat us badly, we are to be "mature." He is not saying God demands moral perfection out of us.
In Matthew 25 we see the servant coming to Jesus with differing amounts of success. Those who did something received a "well done good and faithful servant" although we can assume that by no means were they perfect in their service. Jesus said those who give a cup of cold water in his name will not lose their reward from God. We can assume that the water giver was not morally perfect in every choice. He is called the Judge of all the earth and that means that he weighs the choices a man makes considering all the aspects not that God has one standard of measure, 100% perfect in every choice or "desperately wicked."
My experience is this although this is not scripture and I heard it first from someone else, God is easy to please and hard to satisfy. The man who is afraid and nevertheless does the right thing demonstrates courage whereas the man who is not afraid and does the very same thing does not. God does not judge from the outside but the inside.
Now in fairness, I have to admit that our hearts are very much worse than we suspect. Perhaps, when we see them we will agree that we our desperately wicked. But we make a mistake if we decide that all are desperately wicked judging them and accusing them of evil. We can judge our own hearts or ask God to judge them and this is right. We take the part of the accuser of man when we decide all men are desperately wicked (totally depraved.) In any case, the heart, our heart can rightly be said to be desperately wicked. Best to leave it there.
If a doctrine is in the Bible, then it is true and Jesus is 100% behind it.
I would say that if an atheist did give a birthday present to someone who was giving them a hard time, that, even though they didn't believe in God, they probably did believe in spiritual principles, such as the idea that if you feed your enemy when he is hungry, you will heap burning coals upon his conscience. Said atheist may have experienced qualms of conscience when someone fed them when they were hungry.
And it is not necessarily a virtue to want to heap coals on the conscience of someone who is your enemy. It just may be that you consider that it is an expedient way to deal with the situation.