Answer:
No. The cause of World War 2 in Europe was German expansion by military force (aggression), not its treatment of Jews or dissidents. (Similarly, the cause of World War 2 in Asia and the Pacific was Japanese aggression).
Even though Nazi Germany began arresting political prisoners and forcing many "un-desireables" into concentration camps the Germans did not begin exterminating them until after WW2 began. Even after the war began, Germany kept the holocaust a secret to the outside world. As the truth began to leak out, many people did not believe it---most people had no clue until the truth was revealed by the news after the war and during the Nuremberg war crime trials.
The holocaust did not start World War 2, no one knew about the holocaust until the war was over.
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When World War 2 started in 1939 the Holocaust in the sense of systematic mass killings of Jews hadn't even begun.