Hitler would have to be an entirely different person to avoid the lunacy of the Reich. That person would never reach power.
This being said, without the Holocaust (I am assuming it simply doesn't happen, including to the Roma, Slavs, homosexuals, other religious minorities, etc.) the population of Jews in Europe would increase at the same pace as all other groups in Europe and the U.S. There would be no Israel as there would be no reason for the British to give up the Mandate or withdraw in the face of relatively minor terrorism by Zionist groups like the Sten Gang.
This being said, without the Holocaust (I am assuming it simply doesn't happen, including to the Roma, Slavs, homosexuals, other religious minorities, etc.) the population of Jews in Europe would increase at the same pace as all other groups in Europe and the U.S. There would be no Israel as there would be no reason for the British to give up the Mandate or withdraw in the face of relatively minor terrorism by Zionist groups like the Sten Gang.