I think Tet is confused....just as he is with thinking our Lord has already returned. The verse he quotes says "a living" sacrifice....that would be as opposed to the dead sacrifices the Jews offered up.
Romans 12:1KJV
I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
First we die (crucified with Him), then we are given LIFE (raised with Him)...new creatures created IN Christ Jesus. That would make us LIVING sacrifices...not "spiritual sacrifices". Does Tet seem to know this?
Romans 6:6-7
Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. For he that is dead is freed from sin.
I don't think Tet "reckons" any such thing. He still seems to think he has to do what has already been done for those who have been raised into life.
Romans 6:11KJV
Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
It's the same thing Paul tells us here....."Ye have obeyed from the heart that form of doctrine......" We "yield" ourselves when we believe unto righteousness and are crucified and raised with Christ.
Romans 6:17-22KJV
But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you. Being then made free from sin, ye became the servants of righteousness. I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness. For when ye were the servants of sin, ye were free from righteousness. What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death. But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life.
So, what's the great mystery you think others don't see? I think you're getting way too excited about something you think you see that others may not. Else, why would you go on an on about our being sacrifices? Most people know full well that our Lord's sacrifice is the one that removed the enmity between God and mankind.