By sacrifice I don’t mean “blood sacrifice”, rituals which were conducted during the Old Testament. It is not about killing bulls and goats on the altar of God; neither is it about offering human sacrifice (ie: the ones offered to Baal/Molech, suggested to Abraham offering Isaac). In this article, sacrifice refers to the pleasurable/comfortable things we give up for God (ie: fasting, serving, etc.).
Do they still matter to God?
Or are they done in vain?