Why is the concept of an altar important in Christianity?

In biblical terms, an altar is a place of sacrifice, signifying the importance of atonement and reconciliation with God. The instruction to build an altar in Exodus 20 reflects God's desire for a means to bring sinners into communion with Him through sacrifice. This points forward to Christ, who serves as the ultimate sacrifice on the cross. Through His death and resurrection, believers find access to God not via rituals but through faith in Christ as their altar, fulfilling the need for a perfect sacrifice on their behalf.