The ten commandments were given to Moses by God and Christians are to keep those commandments, Flacaltenn. I agree with you that atheists can live good moral lives. If it were not true we would not be able to find such examples in the Bible, yet we can.
I have known families who do not acknowledge God in any way and have lived lives that would put some who say they are Christian to shame. One family I am thinking of has given to charities, raised their children to be very productive members of society and are very warm, compassionate, caring individuals. Yet they do not follow any religion and have no part of it. I will add that they are Jews but secular Jews who do not believe in or follow God (attending synagogue or Judaism). So what can we derive from this?
First, I thought of Jeremiah 35 which I'll post here - second I thought of Matthew 22 and the verse where it says those who were invited to come to God's Wedding Banquet for His Son refused to come. Then God when they refused to come and turned on God's servants (whom He had sent out) God said they were not worthy and he told His servants to go out into the highway and byways to invite "the good and the bad" to come in so that his banquet hall would be filled. And the good and the bad came in.
Who were the good and the bad? Good people and bad people who had no relationship with God! That's who. People we might call "atheists". Who knows that Don'tTazMeBro's friend will not be among that number when the time comes? You know? God looks upon the heart of a man. Men look at the outer appearance and works of a person but what is the motive behind those works? As we see in the parable of Matthew 22 it certainly wasn't the love of God motivating them. It was something else. Because they had left their first love and refused to return - they lost their salvation and the good and the bad took their place at the wedding banquet for God's Son.
So with that? I agree with you that people who do not believe in God can have good morals. In fact, they can have the very best of morals! Still without Christ, they cannot enter in because it is only through receiving Jesus Christ and being covered by the Blood of the Lamb that we can enter in to the Kingdom of Heaven.
Here is the story the LORD reminded me of (after reading this thread / discussion). It's a story about the Rechabites. They were not
of Israel but I believe they were included in the Abrahamic covenant. As you will see by this story - these Rechabites obeyed their earthly father faithfully whereas God used them as an example to ask
His own children why can't you do the same for me as they do for their father? Look at their faithfulness to their earthly father (their good morals!) their obedience, their willingness to obey their earthly father without question! Even out of love for their earthly father!
It was quite a lesson for the Israelites and it should equally be a lesson for Christians today. If the world can honor their earthly fathers - how much more so should the Children of God Honor God by their obedience and holy lives?
Bible Gateway passage: Jeremiah 35 - King James Version
Jeremiah 35 King James Version (KJV)
35 The word which came unto Jeremiah from the Lord in the days of Jehoiakim the son of Josiah king of Judah, saying,
2 Go unto the house of the Rechabites, and speak unto them, and bring them into the house of the Lord, into one of the chambers, and give them wine to drink.
3 Then I took Jaazaniah the son of Jeremiah, the son of Habaziniah, and his brethren, and all his sons, and the whole house of the Rechabites;
4 And I brought them into the house of the Lord, into the chamber of the sons of Hanan, the son of Igdaliah, a man of God, which was by the chamber of the princes, which was above the chamber of Maaseiah the son of Shallum, the keeper of the door:
5 And I set before the sons of the house of the Rechabites pots full of wine, and cups, and I said unto them, Drink ye wine.
6 But they said, We will drink no wine: for Jonadab the son of Rechab our father commanded us, saying, Ye shall drink no wine, neither ye, nor your sons for ever:
7 Neither shall ye build house, nor sow seed, nor plant vineyard, nor have any: but all your days ye shall dwell in tents; that ye may live many days in the land where ye be strangers.
8 Thus have we obeyed the voice of Jonadab the son of Rechab our father in all that he hath charged us, to drink no wine all our days, we, our wives, our sons, nor our daughters;
9 Nor to build houses for us to dwell in: neither have we vineyard, nor field, nor seed:
10 But we have dwelt in tents, and have obeyed, and done according to all that Jonadab our father commanded us.
11 But it came to pass, when Nebuchadrezzar king of Babylon came up into the land, that we said, Come, and let us go to Jerusalem for fear of the army of the Chaldeans, and for fear of the army of the Syrians: so we dwell at Jerusalem.
12 Then came the word of the Lord unto Jeremiah, saying,
13 Thus saith the Lord of hosts, the God of Israel; Go and tell the men of Judah and the inhabitants of Jerusalem, Will ye not receive instruction to hearken to my words? saith the Lord.
14 The words of Jonadab the son of Rechab, that he commanded his sons not to drink wine, are performed; for unto this day they drink none, but obey their father's commandment: notwithstanding I have spoken unto you, rising early and speaking; but ye hearkened not unto me.
15 I have sent also unto you all my servants the prophets, rising up early and sending them, saying, Return ye now every man from his evil way, and amend your doings, and go not after other gods to serve them, and ye shall dwell in the land which I have given to you and to your fathers: but ye have not inclined your ear, nor hearkened unto me.
16 Because the sons of Jonadab the son of Rechab have performed the commandment of their father, which he commanded them; but this people hath not hearkened unto me:
17 Therefore thus saith the Lord God of hosts, the God of Israel; Behold, I will bring upon Judah and upon all the inhabitants of Jerusalem all the evil that I have pronounced against them: because I have spoken unto them, but they have not heard; and I have called unto them, but they have not answered.
18 And Jeremiah said unto the house of the Rechabites, Thus saith the Lord of hosts, the God of Israel; Because ye have obeyed the commandment of Jonadab your father, and kept all his precepts, and done according unto all that he hath commanded you:
19 Therefore thus saith the Lord of hosts, the God of Israel; Jonadab the son of Rechab shall not want a man to stand before me for ever.
King James Version (KJV)