I think you are confused Dan. Jesus gave Laws to mankind which Abraham obeyed, and which Jesus had Moses recount for His People.
And He also added a Law specifically for the Levites called the Levitical Priesthood. This "ADDED" Law served 2 purposes.
#1. How God's instructions are administered.
Heb. 7:
11 If therefore perfection were by the Levitical priesthood,
(for under it the people received the law,)
#2. How sins are forgiven.
Heb. 9:
6 Now when these things were thus ordained, the priests went always into the first tabernacle, accomplishing the service
of God.
7 But into the second
went the high priest alone once every year,
not without blood, which he offered for himself, and
for the
errors of the people:
This Law was to stay the same until Jesus came and changed it. (See Jer. 31, New Covenant)
The Bible says this priesthood has changed, not gone. Jesus is now our High Priest and is still following the Spiritual intent of the Priesthood, which was never created for the common man anyway, but for the Levites specifically.
How can you preach about God and not know these basic truths about His Word?