The Second Coming of Christ is not to Make Atonement

…so also Christ was offered once to bear the sins of many; and He will appear a second time, not to bear sin, but to bring salvation to those who eagerly await Him.

For we know that since Christ was raised from the dead, He cannot die again; death no longer has dominion over Him.

The death He died, He died to sin once for all; but the life He lives, He lives to God.

…because by a single offering He has made perfect for all time those who are being sanctified.