For in the day that I brought them out of the land of Egypt, I did not speak to your fathers or command them concerning burnt offerings and sacrifices. But this command I gave them: Obey my voice, and I will be your God, and you shall be my people. And walk in all the way that I command you, that it may be well with you.
Jeremiah 7:22-23

Sacrifices were never the foundation of God's true religion nor where they ever necessary for salvation, only a stop-gap mechanism to allow his presence among the people. Obedience, however, is central to all of God's covenants.