After Abraham sacrifice becomes a memorial to Abraham. The other justification for sacrifice is to give surplus food in the form of animals to the poor. The offerer is sacrificing his wealth to help the poor and at the same time offering up the merit of his pious good deed to Allah.
Neither of these reasons justify or explain the purpose behind Abel’s offering of the firstlings of his flock to God:
Genesis 4 v 3 And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the LORD. 4 And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the LORD had respect unto Abel and to his offering: 5 But unto Cain and to his offering he had not respect.
At this point in time there is no poverty in the earth because the earth is fruitful and there is only a small population. Also humans did not begin to eat meat until after the flood. Another problem with the burnt offering, if you are a Muslim, is that there is nothing left over for the offerer or anyone else. It is completely consumed by fire on the altar, after the blood is drained off. There is no way make to this a social act of doing good. It is all for God. A lot of problems for our supremacist friends to explain away I think.