The verse plainly states that the propitiation of Jesus' blood applies to our past sins only. God does not exist in time but our sins certainly do, so your logic is fallacious.
There was a time (most of the Bible) where Jesus has not spilt any blood.
Here again...no HINT of partial salvation.
Daniel 9:9
To the Lord our God belong mercy and forgiveness, for we have rebelled against him
Psalm 103:12
As far as the east is from the west, so far does he remove our transgressions from us.
Psalm 32:5
I acknowledged my sin to you, and I did not cover my iniquity; I said, “I will confess my transgressions to the Lord,” and you forgave the iniquity of my sin.
Psalm 86:5
For you, O Lord, are good and forgiving, abounding in steadfast love to all who call upon you.
Psalm 32:1-2
A Maskil of David. Blessed is the one whose transgression is forgiven, whose sin is covered. Blessed is the man against whom the Lord counts no iniquity, and in whose spirit there is no deceit.
Micah 7:18-19
Who is a God like you, pardoning iniquity and passing over transgression for the remnant of his inheritance? He does not retain his anger forever, because he delights in steadfast love. He will again have compassion on us; he will tread our iniquities underfoot. You will cast all our sins into the depths of the sea.
Proverbs 28:13
Whoever conceals his transgressions will not prosper, but he who confesses and forsakes them will obtain mercy.
Psalm 130:4
But with you there is forgiveness, that you may be feared.
Proverbs 10:12
Hatred stirs up strife, but love covers all offenses.
Isaiah 53:5
But he was wounded for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his stripes we are healed.
Psalm 55:22
Cast your burden on the Lord, and he will sustain you; he will never permit the righteous to be moved.
Isaiah 43:25
“I, I am he who blots out your transgressions for my own sake, and I will not remember your sins.
Psalm 79:9
Help us, O God of our salvation, for the glory of your name; deliver us, and atone for our sins, for your name's sake!
Genesis 3:15
I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.”
Psalm 32:1-11
A Maskil of David. Blessed is the one whose transgression is forgiven, whose sin is covered. Blessed is the man against whom the Lord counts no iniquity, and in whose spirit there is no deceit. For when I kept silent, my bones wasted away through my groaning all day long. For day and night your hand was heavy upon me; my strength was dried up as by the heat of summer. Selah I acknowledged my sin to you, and I did not cover my iniquity; I said, “I will confess my transgressions to the Lord,” and you forgave the iniquity of my sin. Selah ...
Psalm 19:12
Who can discern his errors? Declare me innocent from hidden faults.