Actually there is an aspect of that. Though only offered Himself once on the cross, there is another aspect of His offering that remains forever. He started out in the "form of God" Phil 2:6-11, but then ended up as a glorified human and no longer exists in the purely spiritual form of God. That change is permenant and forever. His very presence in Heaven as a glorified Human and lamb of God is a permanent condition. When I first read what you were saying I pictured Him doing some wierd ritual to offer himself or something. If you are still thinking that than I still disagree but there is a continual offering aspect to Him in Heaven that definitely does exist.
We know what the High Priest did on Yom Kippur. That may have been a "weird ritual," but it was a weird ritual directly prescribed and demanded by God, so who are we to judge?
Scripture doesn't describe in detail what it means for Jesus to offer himself continually to the Father in heaven. We probably couldn't comprehend it if it did. Our faith teaches us that the Mass makes that offering present on earth.
He started out in the "form of God" Phil 2:6-11, but then ended up as a glorified human and no longer exists in the purely spiritual form of God. That change is permenant and forever. His very presence in Heaven as a glorified Human and lamb of God is a permanent condition.
Exactly. You'll notice that when St. John sees Jesus in Revelation, he sees him "looking like a Lamb that had been slain".