How I wish we could sit over coffee and talk.
I try to see scripture from God's point of view, from looking at things without our limitations of living in time. God lives in eternal time, so when God told people to sacrifice animals God knew what Christ did and that the animal blood was only symbolic. It must have been bewildering to people of that time when God asked for animal sacrifice. As we read in Isaiah some people did that as the pagans did, to feed God. Isaiah tells us that disgusted the lord.
When you study all the OT scriptures that speaks of the salvation offered in OT times, it points to that the only difference in it was that what changed when our kinds of time applied only from symbolic blood to the blood of Christ.
In Hebrews 11 it is OT saints that are listed as having faith.
There are so many scriptures that tell us God is eternal and stays the same always. The physical world changes constantly. Eternity is a difficult concept for us.