What we have here is a disconnect. The Lord wants relationship, not our stuff. Cain valued his stuff and did not appreciate the Lord not valuing it Himself.
Interestingly, the pride and SelfWorship in Cain enabled Him to be angry at His Creator!
That is an indication of the depth of Satanic involvement in Cain^s life.
We see this kind of anger in atheists and agnostics who resent their dependence on the Creator.