You don't have to teach a child to do evil. You have to teach them to do good (Psalm 51:5/ Ephesians 2:2-3). It's like my grandfather used to say: "Children aren't little angels, they're little devils. You have to teach them to be little angels." (Proverbs 22:15/ Genesis 8:21) Fallen nature my friend demands divine intervention, but it is true that we must respond. So I would argue that this is Synergistic and Monergistic. The reason people have been arguing over this for a long time and will continue to is because it is hard to understand. Justification is Monergistic and Sanctification is Synergistic. God isn't bound by time or space like we are, so it's just one of those things that is beyond us. All of that being said, we are responsible to respond to God's calling. This is how we will be judged. Faith, and of course the fruit of it, which is works. Even our response to our own sins will be judged. Why was David restored after knowingly sinning against God with Bathsheba? True repentance and faith. Our sinful actions are a result of an inward corruption that can only be cured by the Gospel and the power of the Holy Spirit (Jeremiah 17:9/ Psalm 14:2-3). Justification is one of those things that we cannot really see from our standpoint. We know it is Biblical and certainly a reality. When we see things like what God told Jeremiah in 1:5 of his book. That being said, God hasn't revealed that to me individually. Therefore, all I have to look at is my Sanctification (Faith and the fruit thereof). The Bible tells us that the believer is saved, yet he is being saved, and he will be saved (Ephesians 2:8/ 2 Corinthians 4:16/ 1 Peter 1:5). These are all true, and this doesn't relinquish our responsibility to respond. Death itself is a curse and a result of sin (Romans 5:12/ 6:23). The question we need to ask is: "If humanity isn't born with a sin nature, shouldn't have we expected to see some folks who "beat the odds?" so to speak. I'm afraid there is no way around our "sin" nature and problem other than the Good News of Jesus and the Kingdom. It is only by the power of God that we exist and are able to make the choices necessary to rise up from the ashes of death and destruction.