That's an interesting interpretation Linda, but it doesn't hold water. First of all, because you have just contradicted yourself. Paul is speaking to Christians here, which means they are saved. If a Christian will be judged for making animal sacrifices, then you have just proven that the once saved always saved doctrine is false.
Second, you have no case for your interpretation, even if it didn't contridict itself. Up to verse 17, Paul is contrasting the differences between the old and new covenants, and how Christ is the all-sufficient sacrifice. Verse 18 is the summation of this thrust:
18 And where these have been forgiven, there is no longer any sacrifice for sin.
Meaning, where your sins have been forgiven, there is no longer any requirement to make a sacrifice for sin. Then it continues on:
19 Therefore, brothers,
Therefore, as in, "since all of those things we just covered are true"
Brothers, as in, Christians
since we have confidence to enter the Most Holy Place by the blood of Jesus, 20 by a new and living way opened for us through the curtain, that is, his body, 21 and since we have a great priest over the house of God, 22 let us draw near to God with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water.
He then starts to affirm the greater truth of our salvation. Verse 19-22 is admonishing the brethern, on the basis of Christs sacrifice, to approach God with full confidence
23 Let us hold unswervingly to the hope we profess, for he who promised is faithful. 24 And let us consider how we may spur one another on toward love and good deeds. 25 Let us not give up meeting together, as some are in the habit of doing, but let us encourage one anotherand all the more as you see the Day approaching.
23-25 Is reiterating the necessarity of faith and of mutual encouragement.
26 If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, 27 but only a fearful expectation of judgment and of raging fire that will consume the enemies of God.
Now he is showing the consequences of unrepentant, habitual sin under the new covenant. When you receive knowledge of the truth, IE, salvation, and you keep on sinning, "no sacrifice for sin is left". Meaning, there is no sacrifice for sins at all, whether by an animal or by the blood of Christ. No sacrifice what so ever. Meaning, once you get saved, if you keep living like a demon you're all out of options.
28 Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. 29 How much more severely do you think a man deserves to be punished who has trampled the Son of God under foot, who has treated as an unholy thing the blood of the covenant that sanctified him, and who has insulted the Spirit of grace
Verse 28-29 makes this clear. Anyone who rejects the law of moses died without mercy on the testimony of two or three witnesses. And that was just for rejecting the law of Moses. It is clearly saying that a person who rejects the blood of Christ that sanctifies him, meaning that he is saved, is deserving of a far worse punishment than that. So, the verse clearly states you can lose your salvation for "treating as an unholy thing the blood of the covenant that santifies you".
I would also like you to address my other examples and not just cherry pick out of my post what you think you can justify.