GREAT QUESTIONS! and GREAT ANSWERS!
I've always liked to refer to this passage in 2 Corinthians regarding repentance:
2 Corinthians 7:8 For though I made you sorry with a letter, I do not repent, though I did repent: for I perceive that the same epistle hath made you sorry, though it were but for a season.
9 Now I rejoice, not that ye were made sorry, but that ye sorrowed to repentance: for ye were made sorry after a godly manner, that ye might receive damage by us in nothing.
10 For godly sorrow worketh repentance to salvation not to be repented of: but the sorrow of the world worketh death.
11 For behold this selfsame thing, that ye sorrowed after a godly sort, what carefulness it wrought in you, yea, what clearing of yourselves, yea, what indignation, yea, what fear, yea, what vehement desire, yea, what zeal, yea, what revenge! In all things ye have approved yourselves to be clear in this matter.
The people at Corinth received Paul's first epistle making them aware of their sin. Apparently they were blindly going on in a religious "Christian" way with obvious sin that they had not turned from. Sin IS a choice, although the tree is planted in our garden when we are born, we choose to pick the fruit and eat it:
James 1:13 ¶Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man:
14 But every man is tempted, when he is drawn away of his own lust, and enticed.
15 Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.
When the people of Corinth read Paul's first epistle, and saw the greatness of their guilt, they had a reaction . . . SORROW . . . GODLY SORROW . . . which led to repentance. Their repentance was proven in the way that they reacted to their sorrow:
"what carefulness it wrought in you, yea, what clearing of yourselves, yea, what indignation, yea, what fear, yea, what vehement desire, yea, what zeal, yea, what revenge! In all things ye have approved yourselves to be clear in this matter."
When God makes a sinner aware of the GREATNESS of his sin, he will either believe God and react as the people of Corinth did, and end up totally washed, and clear in the matter by confessing (1John 1:9), or he will ignore the voice of the Holy Ghost knocking on the door of his conscience, and continue to believe that his sin is not such a big deal.