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In Catholicism, there is nothing truly new about the New Covenant. If you can come to the cross repeatedly, receive the sacrifice over and over, yet still not be perfected and even risk hell due to mortal sin, how is that any different from the Old Covenant’s sacrificial system? The defining feature of the Old Covenant was its endless cycle of sacrifices—offerings that could never take away sins but had to be continually repeated (Hebrews 10:1-4). These sacrifices were not meant to be permanent; they were shadows pointing to the ultimate sacrifice of Christ (Hebrews 10:12). The entire system functioned as a reminder of sin (Hebrews 10:3), never actually cleansing the worshiper or granting lasting assurance. But the New Covenant is truly new because Christ’s sacrifice was once for all (Hebrews 10:10). His offering actually accomplishes what the Old Covenant never could—perfecting the believer for all time (Hebrews 10:14). According to the apostles, this is the heart of the gospel: Christ’s work on the cross was complete, sufficient, and final. Those who are in Christ do not stand in an uncertain, repetitive cycle of atonement but rest in the assurance that their sins are fully forgiven (Colossians 2:13-14). However, the Roman Catholic system refuses to embrace this reality. Instead of recognizing Christ’s sacrifice as once-for-all, it reintroduces the Old Covenant’s ongoing sacrificial system under the terminology of the New Testament. The Catholic Mass presents the Eucharist as a "re-presentation" of Christ’s sacrifice, meaning that, in their view, Christ is continually offered again and again. This directly contradicts Hebrews 10:12, which states that Christ "offered for all time a single sacrifice for sins" and then "sat down at the right hand of God." The act of sitting signifies completion—His sacrificial work is finished. Yet, in Catholicism, Jesus is never allowed to sit. Instead, they keep Him busy dying, never completing His sacrifice, never interceding as our High Priest who has already secured redemption (Hebrews 7:25). By perpetuating an unending sacrificial system, the Catholic Church denies the very truth that makes the New Covenant new. Furthermore, Catholicism reinstates a priesthood, mirroring the Levitical system that Hebrews explicitly states has been fulfilled in Christ (Hebrews 7:23-25). The New Covenant does not require an ongoing priestly mediatorship because Christ Himself "always lives to make intercession" for His people (Hebrews 7:25). Yet, Catholicism maintains a sacrificial priesthood, functionally replacing the direct access believers now have to Christ (Hebrews 4:16). Even the concept of mortal sin in Catholicism keeps believers in perpetual uncertainty, much like those under the Old Covenant who never had full assurance of atonement. In contrast, the New Covenant brings confidence: "Where there is forgiveness of these, there is no longer any offering for sin" (Hebrews 10:18). If sin has been fully atoned for, why is sacrifice "re-presentation" necessary? Why must grace be repeatedly re-accessed through sacraments? Ultimately, the Catholic Church has rejected the New Covenant in practice, choosing instead to disguise the Old Covenant’s structures in New Testament language. It speaks of grace but binds believers to a system of works. It proclaims Christ’s sacrifice yet insists it must be continually re-presented. It acknowledges forgiveness but denies assurance. In doing so, it undermines the very thing that makes the New Covenant new: the finished, perfect, and all-sufficient work of Christ.