One more time: your fundamental error is confusing the death of the sacrificial victim with the offering of the sacrifice. If a priest in the Jerusalem Temple had just slaughtered a Lamb or a bull & walked away, he would have just made a bloody mess, not offered a sacrifice to God according to the regulations set forth in the Law.
How many times does the blood of a sacrifice have to be offered up be before it's atoning work is done?
I'm going to trust that Jesus, as my High Priest, offering his own blood was sufficient to cover all my sins, past, present, and future and that His promise of the gift of His righteous for my sin would allow me to stand in His presence today perfect in Him, spotless and clean.