The setting of the Vatican is crucial. Michael seeks absolution from Cardinal Lamberto, confessing his most heinous sins. While he receives a formal penance, the film suggests that true forgiveness is unavailable to him. The "Godfather" has spent his life playing God, deciding who lives and dies; when he finally humbles himself before the actual Church, he find it just as corrupt and power-hungry as the Commission he once ran. The Final Collapse
Michael Corleone’s central arc in Part III is defined by his quest for "legitimacy." By 1979, he has liquidated the family’s criminal assets and seeks to buy his way into the grace of the Vatican through the International Immobiliare. However, Francis Ford Coppola argues that legitimacy is not a destination one can reach through wealth, but a state of being Michael discarded decades prior. The Godfather Part 111
In the end, Michael does not die in a hail of bullets like a gangster, nor does he die with the dignity of a statesman. He dies alone in a dusty courtyard in Sicily, remembered by no one, accompanied only by a stray dog. It is a quiet, devastating conclusion to the greatest epic in American cinema, proving that the ultimate price of power is the total loss of everything worth having. The setting of the Vatican is crucial