Clytemnestra

If Kierkegaard does not specify what the Absolute is, could one take that as any deity that they believe in? In that case, a person could have Satan as the Absolute. They could use him to kill people and cause havoc. Would it still be ethical for if the person did not try to justify his action? I just do not get how a person can follow the Absolute and kill someone and it is ethical. He uses Agamemnon killing Iphigenia as a tragic hero and being ethical. He sacrificed her as repentance for offending a goddess, and he also did it to regain her favor in the upcoming war. If that was ethical and made Agamemnon a tragic hero, does that make Clytemnestra, his wife, a Knight of Faith? Clytemnestra did not justify her reasons for killing her husband and Cassandra, his lover. So does that make her murders somehow less bad?