Gonna have to agree to disagree with you there, bud. I agree it was only one aspect of His overall purpose. But He died to make atonement for the sins of the world, meaning He did pay a sin debt. After all, without shedding of blood there is no remission of sin. The sacrifices of bulls and goats sufficed only for a time. The sacrifice of Christ, dying the death we deserved, as many others have said, made the difference.
We are not delivered from physical death, because this body still must die, seeing as it is corrupted by sin. The corruptible must put on incorruption; the mortal must put on immortality. We are delivered from spiritual death, meaning the second death of the Bible, which is the Lake of Fire. We are freed from that, thanks to Christ atoning for us and now making intercession for us. We are freed from the pain and sting of death, and the "victory" of the grave, by Christ rising from the dead and coming out of the tomb victorious over death and Hell.
We are delivered from Satan in that Christ has sealed us up to the day of redemption. This does not mean we are freed from the antagonizing efforts of Satan. I firmly believe Satan seeks to tear down any Christian he can. Satan does not need to tear down the lost, because they are already where he wants them to be. Tearing down someone already established in their walk with God is like a trophy for Satan.