If you look through the Torah, it was always clear God allowed Jews the option of committing sacrifices on His behalf. That's all it was. Judaism is more concerned with ethical conduct than with fulfilling ritual norms. The prophetic literature doesn't deal by and large with ritual violations. For the Prophets, the sin of the Jews lay in their failure to act justly in their dealings with their fellow men and by extension with God. The task of Man on this earth is to be the best person he can be. Then and only then will he will have a loving relationship with His Creator.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus
Judaism is more concerned with ethical conduct than with fulfilling ritual norms. "Values over blood," as Dennis Prager has put it...which I agree too applies to sacrificial blood.
Also, but aside, polygamy seems to have been in error given Genesis II 24.