Judaism, Heaven, and Oneness

I was told that Judaism does not believe in Heaven, that we are gone after death. I thought, that's a funny kind of religion, not spiritual?

But I looked it up and found this very interesting bit:

At death the soul and body separate. King Solomon said, “The dust will return to the ground as it was, and the spirit will return to God who gave it” (Ecclesiastes 12:17). This means the soul returns to heaven, back to God, where it is enveloped in the Oneness of the Divine.
(From Jews for Judaism site.)

There is probably a lot of disagreements and ignorance about these things, as about everything, but it shows us that at least a sizable part of Jewish intelligentsia not only believes in Heaven, but sees it as a Oneness, which I find highly interesting since it approaches non-dualism.

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This is just a throw-in comment. I know very little about religions, and I dont have too much interest in them since it seems to me they are more concerned with regulating behavior than with education, much less with how to get to Heaven or Oneness.