Regarding Yonah`s comment above: I agree that Zionism, the Nation, requires the religious heritage to survive, even just to be complete. However, the reverse dependence may be also true, even as many would be reluctant to admit. Namely, at this historical juncture, as different from previous ones, what future Judaism really has without the existence of Israel?
The two are now inextricably intertwined. Something truly big happened in Jewish history in the return of the nation to a land of its own (which, importantly, it is an intrinsic part of its eschatology - the divinely promised one), and there is no going back to the past anymore, in any clear sense.
To sum up the above: the interrelations between Israel/ Zionism on one hand and the World Jewry/Judaism on the other hand is not at all a simple topic – involves many related issues. It is also an evolving one – Israel, after all, is in historical terms a new phenomenon.
Whatever the case, to me it`s a great thing to be fortunate enough to be born, within the Jewish history, into the generation that has seen the rebirth of Israel – what few people in the past really expected to materialize (even as they were daily praying for it) – which, astonishingly, came on the heels of the complete opposite of it: one of the lowest points in Jewish history and its greatest tragedies. These are all truly BIG things, except that by living through them, with their everyday mundane details, we lose sight of the grand scope here. That probably will be what future historians will be concerned with.