Christians: Why is free will promoted as sound theology?

Just by taking a brief overview of the Bible you can tell that God's will was imposed, and not man's. What happened in the Garden of Eden was not God's slip up. After all, how did evil come about in the world. It wasn't man's will overpowering God's. Consider Rom 9:19, Thou wilt say then unto me , Why doth he yet find fault? For who has resisted His will (KJV). And verse 22, What if God, willing to shew his wrath, and to make his power known, enduring with much long suffering the vessels of wrath fitted to destruction (KJV). Paul wasn't asking a hypothetical question. So called atheist and others try to mock God by saying that surely a loving God would not condemn sinners who have not heard about salvation. Or the Himalayan monk five hundred miles from civilization, surely his god is good enough for him. Or they may ask, isn't my ignorance of truth enough to prevail against God's sovereignty. Consider another verse, John 17:12...I kept them in thy name: those that thou gavest me I have kept, and none of them is lost, but the son of perdition (Judas); that the scripture might be fulfilled. Does it sound like Judas had a free will? Could he have done any different? If you have any thoughts on this, please share them.