God forgives those who are repentant. I don't think anyone who has honestly sought God has been turned away from His mercy. While the Prodigal Son is a great story about repentance, and something that I can relate to greatly in my own life, there is also a flip side to it. Observe this parable in Matthew 18:
"Therefore is the kingdom of heaven likened unto a certain king, which would take account of his servants.
And when he had begun to reckon, one was brought unto him, which owed him ten thousand talents.
But forasmuch as he had not to pay, his lord commanded him to be sold, and his wife, and children, and all that he had, and payment to be made.
The servant therefore fell down, and worshipped him, saying, Lord, have patience with me, and I will pay thee all.
Then the lord of that servant was moved with compassion, and loosed him, and forgave him the debt.
But the same servant went out, and found one of his fellowservants, which owed him an hundred pence: and he laid hands on him, and took him by the throat, saying, Pay me that thou owest.
And his fellowservant fell down at his feet, and besought him, saying, Have patience with me, and I will pay thee all.
And he would not: but went and cast him into prison, till he should pay the debt.
So when his fellowservants saw what was done, they were very sorry, and came and told unto their lord all that was done.
Then his lord, after that he had called him, said unto him, O thou wicked servant, I forgave thee all that debt, because thou desiredst me:
Shouldest not thou also have had compassion on thy fellowservant, even as I had pity on thee?
And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him.
So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses." - Matthew 18:23-35
I shudder to think that I haven't been forgiving enough that when I face God, that I would end up like that unforgiving servant. God has given each of us a conscience to know when we have wronged someone or when we need to forgive those who wronged us, but if we do not take the time to things right, then we are going to have to face God with that on our conscience.
Hell is made for the unrepentant.