Shabby argument. Let's go over 2 Timothy 3:16 again - and throw v.17 into the mix for kicks.
All Scripture is:
God-breathed
useful for teaching
useful for rebuking
useful for correcting
useful for training in righteousness.
thoroughly equipping the man of God for every good work.
So, the "argument" goes, how can a myth be all these things? I'm sorry to burst the bubble but they can be.
1. A myth can be God-breathed.
When Jesus told the parable of the Sower, He explicitly told His disciples that it was a parable, i.e. a fabricated story intended to make a point. Now, Jesus is God, and anything He says certainly qualifies to be called "God-breathed", which include all His parables. And yet while we worry about the archeological veracity of the Old Testament, we don't worry that when we go to Heaven Jesus will say "Look - there was no Good Samaritan! I made him up Myself!" ... why? Because a myth is not meant to be historical. And yet that ahistoricality doesn't detract anything from it being God-breathed.
2. A myth can be useful for teaching.
Anybody who's told their children fairy tales before tucking them into bed knows this.
3. A myth can be useful for rebuking.
The LORD sent Nathan to David. When he came to him, he said, "There were two men in a certain town, one rich and the other poor. The rich man had a very large number of sheep and cattle, but the poor man had nothing except one little ewe lamb he had bought. He raised it, and it grew up with him and his children. It shared his food, drank from his cup and even slept in his arms. It was like a daughter to him. "Now a traveler came to the rich man, but the rich man refrained from taking one of his own sheep or cattle to prepare a meal for the traveler who had come to him. Instead, he took the ewe lamb that belonged to the poor man and prepared it for the one who had come to him." David burned with anger against the man and said to Nathan, "As surely as the LORD lives, the man who did this deserves to die! He must pay for that lamb four times over, because he did such a thing and had no pity." Then Nathan said to David, "You are the man!" (2 Samuel 12:1-7 NIV)
4. A myth can be useful for correcting.
Now one of the Pharisees invited Jesus to have dinner with him, so he went to the Pharisee's house and reclined at the table. When a woman who had lived a sinful life in that town learned that Jesus was eating at the Pharisee's house, she brought an alabaster jar of perfume, and as she stood behind him at his feet weeping, she began to wet his feet with her tears. Then she wiped them with her hair, kissed them and poured perfume on them. When the Pharisee who had invited him saw this, he said to himself, "If this man were a prophet, he would know who is touching him and what kind of woman she is--that she is a sinner." Jesus answered him, "Simon, I have something to tell you."
"Tell me, teacher," he said. "Two men owed money to a certain moneylender. One owed him five hundred denarii, and the other fifty. Neither of them had the money to pay him back, so he canceled the debts of both. Now which of them will love him more?" Simon replied, "I suppose the one who had the bigger debt canceled."
"You have judged correctly," Jesus said.
(Luke 7:36-43 NIV)
5. A myth can be useful for training in righteousness.
On one occasion an expert in the law stood up to test Jesus. "Teacher," he asked, "what must I do to inherit eternal life?" "What is written in the Law?" he replied. "How do you read it?" He answered: " 'Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind'; and, 'Love your neighbor as yourself.'" "You have answered correctly," Jesus replied. "Do this and you will live." But he wanted to justify himself, so he asked Jesus, "And who is my neighbor?" In reply Jesus said: "A man was going down from Jerusalem to Jericho, when he fell into the hands of robbers. They stripped him of his clothes, beat him and went away, leaving him half dead. A priest happened to be going down the same road, and when he saw the man, he passed by on the other side. So too, a Levite, when he came to the place and saw him, passed by on the other side. But a Samaritan, as he traveled, came where the man was; and when he saw him, he took pity on him. He went to him and bandaged his wounds, pouring on oil and wine. Then he put the man on his own donkey, took him to an inn and took care of him. The next day he took out two silver coins and gave them to the innkeeper. 'Look after him,' he said, 'and when I return, I will reimburse you for any extra expense you may have.' "Which of these three do you think was a neighbor to the man who fell into the hands of robbers?" The expert in the law replied, "The one who had mercy on him."
Jesus told him, "Go and do likewise."
(Luke 10:25-37 NIV)
6. A myth can thoroughly equip the man of God for good work.
"At that time the kingdom of heaven will be like ten virgins who took their lamps and went out to meet the bridegroom. Five of them were foolish and five were wise. The foolish ones took their lamps but did not take any oil with them. The wise, however, took oil in jars along with their lamps. The bridegroom was a long time in coming, and they all became drowsy and fell asleep. "At midnight the cry rang out: 'Here's the bridegroom! Come out to meet him!' "Then all the virgins woke up and trimmed their lamps. The foolish ones said to the wise, 'Give us some of your oil; our lamps are going out.' " 'No,' they replied, 'there may not be enough for both us and you. Instead, go to those who sell oil and buy some for yourselves.' "But while they were on their way to buy the oil, the bridegroom arrived. The virgins who were ready went in with him to the wedding banquet. And the door was shut. "Later the others also came. 'Sir! Sir!' they said. 'Open the door for us!' "But he replied, 'I tell you the truth, I don't know you.' "Therefore keep watch, because you do not know the day or the hour.
(Matthew 25:1-13 NIV)
So, let's put it all together. Emending 2 Timothy 3:16,17 a bit,
Genesis 1, a myth, is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work.
See? That wasn't so insurmountable an argument after all.