If I may add my understanding in the mix I believe we first need to look at the sacrifice of the passover lamb and what it's significance in the whole process of the sanctuary service entails. The blood that covered the door posts was symbolic of Jesus Christ's blood covering our sin. "...sin lieth at the door..." Which when accepted by faith is an act of being "justified."
Yet, one could not approach the tabernacle unless they had first become an Israelite either by birth or by initiation, accepted the passover lamb, and become "circumcised" - just like a native born Israelite. See Exodus 12:49-49.
Num 9:14 And if a stranger shall sojourn among you, and will keep the passover unto the LORD; according to the ordinance of the passover, and according to the manner thereof, so shall he do: ye shall have one ordinance, both for the stranger, and for him that was born in the land.
See Numbers 15:13-16 also.
So in answer to your initial question Alan
"So Christ comes to fulfill his life's mission but did I miss where the pivital point came where the sins of humanity were laid on him like the symbolic type?"
I see it as the covering of sins as being done and there acceptance as an act of faith by the individual that desires himself and his family to avoid the curse of the angel of death. The sacrifice is there, it has been done and completed, yet it still must be accepted before one is allowed in the heavenly sanctuary where, instead of offering the blood of bulls and goats, now offers up "spiritual sacrifices" that are acceptable to God.
1Pe 2:5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood,
to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
Hope that makes sense.