The Godfather Baptism Killings In The Godfather, can anyone that is more familiar with the Catholic faith, tell me if Michael would be considered absolved of his sins considering that he agrees to "renounce satan and all of his works"? Having done this after all of the hits of the crime bosses are carried out?

The Baptism Murders
No, Michael Corleone would not be absolved, because he was not answering for himself.

A godparent at an infant baptism speaks on behalf of the infant.  When the priest asks, "Do you renounce Satan?" and the other questions, he's asking this of the infant to be baptized, not of the godparent. The godparent answers because the infant can't speak for him/herself at that age.

An older child or adult being baptized would answer the questions for him/herself.