ALL sin is forgiven. Past, because also those who died before Jesus death and went to wait in Abraham's Bossom are now in heaven. Present and future are self-explanatory.
Hyper-Grace teaches that when you believe in Christ, that moment, all YOUR sin, past, present and future, without your confession of any sin, is forgiven...
Lets look at what Jesus said are the grounds for forgiveness.
3 Take heed to yourselves.
If your brother sins against you, rebuke him; and if he repents, forgive him. 4 And if he sins against you seven times in a day,
and seven times in a day returns to you, saying, ‘I repent,’ you shall forgive him.” Luke 17:3-4
15 “Moreover if your brother sins against you, go and tell him his fault between you and him alone.
If he hears you, you have gained your brother. 16 But if he will not hear, take with you one or two more, that ‘by the mouth of two or three witnesses every word may be established.’17 And if he refuses to hear them, tell
it to the church. But
if he refuses even to hear the church, let him be to you like a heathen and a tax collector. Matthew 18:15-17
The basis of having your sins forgiven is repenting.
We also know from the rest of the teaching from Matthew 18, that if we don't forgive from the heart, then neither will our heavenly Father forgive us.
So much so, that we can indeed be forgiven, then later have that very forgiveness revoked, and end up being punished for our sins.
32 Then his master, after he had called him, said to him, ‘You wicked servant! I forgave you all that debt because you begged me. 33 Should you not also have had compassion on your fellow servant, just as I had pity on you?’ 34 And his master was angry, and delivered him to the torturers until he should pay all that was due to him.
35 “So My heavenly Father also will do to you if each of you, from his heart, does not forgive his brother his trespasses.”
Matthew 18:32-35
Notice that the fellow servant, who owed him a hundred denarii, did humbled himself and ask for mercy, and time to pay the debt, which is the attitude of repentance, yet was given no mercy or forgiveness from the man who had just been forgiven the greater debt.
The Point: To expect to be forgiven, we need to confess our sins and repent.
If we confess our sins, He is faithful and just to forgive us
our sins and to cleanse us from all unrighteousness. 1 John 1:9
I don't find any scripture that says if we simply believe in Jesus Christ, all of our sins, past present and future are automatically forgiven at that moment, no matter how we continue to live our lives, and no matter if we never confess another sin.
JLB