I think the truth is more complex and monotheism only evolved much later in Jewish history, maybe in response to Christianity. Some historians have argued that ancient Israel originally practiced a form of monolatry or henotheism. If you wish to talk about Jewish perceptions of God you have to specify a time since it was a moving target.I thought the link to Huston Smith's comments answered this but you didn't seem to agree with me so. I'll accept the wikipedia's answer to your question. But to be honest it's not that hard to figure out if you read the OT.
Jews traditionally believe in a monotheistic conception of God (God is only one), which is both transcendent (wholly independent of, and removed from, the material universe) and immanent (involved in the material universe).
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God in Judaism - Wikipedia
en.wikipedia.org
Or this one too.
The Nature of God / Torah 101 / Mechon Mamre
Discusses the fundamental Jewish beliefs about the nature of God and His relationship with the universe and with humanity.mechon-mamre.org