There are several points in the God of War series when Kratos comes upon statues of Poseidon.
In the God of War Series[]
God of War: Ascension[]
Statue of Poseidon in GoW: Ascension multiplayer.
A giant statue of Poseidon appears in Olympus during the beginning of God of War: Ascension's multiplayer mode. If the warrior activates it then they can choose to submit their soul to Poseidon.
God of War: Chains of Olympus[]
The Temple of the Gods, in the depths of Tartarus, contains a statue of Poseidon, along with a statue of Zeus and Hades. After obtaining the Gauntlet of Zeus, Kratos must shatter the statue along with the other two.
God of War[]
In the Challenge of Poseidon in Pandora's Temple, Kratos finds a massive statue of Poseidon within Poseidon's Chamber. At the end of the temple there is a statue of Poseidon, along with statues of Zeus and Hades, in the chamber containing Pandora's Box.
God of War: Ghost of Sparta[]
In game, Kratos visits Atlantis, the city of Poseidon, that contains many statues of the sea god. Later on he manifests himself in one of the statues to threatened Kratos of the destruction of his city.
God of War II[]
Poseidon is one of the six God Statues that Kratos comes upon in the Garden of the Gods within the Palace of the Fates.