It comes as no surprise to anyone with even a passing acquaintance with the Bible that God of the Old Testament (jealous, vindictive, fond of punishing the innocent) is radically different from the God of gospels (redemption, golden rule). This is a major theological problem, since presumably they are supposed to be the same deity, who somehow underwent a major personality change.
Of course, many ignore this discrepancy by simply ignoring the depiction of God in the Old Testament.
This excerpt from the excellent movie God on Trial is the most dramatic reminder of the real story of the Old Testament deity. The film is set in Auschwitz, where a barracks of Jewish inmates put God on trial for breach of contract. This is the climactic speech in this trial.