When Did God Show Up in Supernatural?

Chuck may have been revealed as God in Season 11 of Supernatural but the writers set that up way before starting in Season 4 of the beloved CW series.
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For 15 Seasons, Supernatural Talked a Lot About God (But Didn't Know Him Very Well). - Plugged In

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It's time to start cancelling shows! Few matchups for Chuck Shurley/God ( Supernatural). Looking for some additional ideas. : r/DeathBattleMatchups

When Did God Show Up in Supernatural? - IMDb

When Did God Show Up in Supernatural? - IMDb

It – He – They're Back! Supernatural 'Don't Call Me Shurley' – Fangasm

God (Supernatural), Villains Wiki