When you blow it, God still celebrates His Son in you. The litmus test of whether or not you understand the gospel is what you do when you fail. Do you run from Him and go clean yourself up a little bit before you come back into the throne room? Or do you approach the throne of grace with confidence? If you don't approach the throne of grace with confidence, you don't understand the gospel.
The marker of those who understand the gospel of Jesus Christ is that, when they stumble and fall, when they screw up, they run to God and not from him, because they clearly understand that their acceptance before God is not predicated upon their behavior but on the righteous life of Jesus Christ and his sacrificial death.
Jesus doesn't avoid those who mess up. Jesus runs to those who mess up.
The universe shudders in horror that we have this infinitely valuable, infinitely deep, infinitely rich, infinitely wise, infinitely loving God, and instead of pursuing him with steadfast passion and enthralled fury — instead of loving him with all our heart, soul, mind, and strength; instead of attributing to him glory and honor and praise and power and wisdom and strength — we just try to take his toys and run. It is still idolatry to want God for his benefits but not for himself.
I believe the sovereign God of the universe justifies us freely, and then we are called to run with him in sanctification.