Arya never believed in the faceless god--she was just using them to learn their abilities. The story of her list is the concept of revenge vs. justice. Yes, everyone on the list did bad things but does she keep the list because she wants justice or because she wants revenge. When she left Braavos and killed the Freys, that was about revenge and it placed Arya in a very dark spot--she was still in this dark spot, consumed by a lust for revenge when we ended last season. Her redemption will come in learning that there are other things that are more important.
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