What is the Difference anyhow?
If salvation were a future event; something that would happen to a certain class of people only on the day that God wraps this thing up, then we would not expect there to be a difference in people. But, the Bible is clear that God does something internally to people who are born again of the Spirit of God. There is the fact that Jesus comes into a person that is born again of the Spirit of God.
There is the fact that the Spirit of God comes in to the born again person. (I Corinthians 3:16). All of the scripture that alludes to the different nature of a born again person insists that there be a real tangible difference in the believer and the unbeliever. Since all of us are sinners, there rises a question as to how different are we? I have known of believers who have robbed banks. I have known of believers who have stolen cars. I have known of believers who have cheated on their spouses. Each of these references are of real individuals whose names are known by me. I have known of other people who have professed to be saved and have committed other sins including murder, but I saw no return to God in their lives, so I cannot know for sure that they were saved. So what is the prevailing difference in the true born again person? It is the power of the Holy Spirit within.
A person that has been born of God gains the same attitude that God has about sin. Even though he or she is able and prone to commit sin, there is a revulsion toward sin that the unsaved does not share. I have heard professing Christians swear, tell dirty stories, lie, cheat and reveal a carnal nature that are not bothered by the internal influence of the Holy Spirit. If they are confronted with their tendency to relish sin, they blame God for not taking it out of them or they claim that God would forgive them anyway. They really do not have a heart for the things of the Lord.
A professing Christian can be 100% faithful to Church, but not have a heart for God. They can hold some office or position in the Church, yet not have a heart for God. A true believer will give evidence of his or her true relationship to God, even through guilt for existent sin. A believer will be concerned about the effect his or her sin has upon God rather than about the immediate consequences of that sin. A believer will assume a personal child / father relationship to God rather than a creator / creature relationship.