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"He also said he was forgiving all sin past, present and future. "

Actually, besides what I wrote to you before,

"God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God; (Romans 3:25) But he that lacketh these things [virtue; knowledge; temperance; patience; godliness] is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins." (2 Peter 1:9)

If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. (1 John 1:8-9)

For a multitude of the people, even many of Ephraim, and Manasseh, Issachar, and Zebulun, had not cleansed themselves, yet did they eat the passover otherwise than it was written. But Hezekiah prayed for them, saying, The good Lord pardon every one (2 Chronicles 30:18)

But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Romans 4:5)

Meaning that past sins are forgiven on Christ's expense, and present and future sins are not imputed to those of true contrite and repentant faith, and who thus contritely confess sins in repentance when convicted of sin, as David immediately did when fingered by Nathan.

And while this is what believers do when faced with their sins, yet there are multitudes occasions of iniquity, that we are not aware of, but since justification is by faith being imputed for righteousness, and not that of attaining to practical perfection, then all those who are effectual faith, which does confess sins when convicted of sin yet who are not aware of many (I dare say most) are yet "accepted in the Beloved" on His account.

However, to harden one's heart at reproof in rebellion is a mark of unbelief toward the Lord Christ, and to die in such is to forfeit what faith obtains, as shown and explained.