In my own response to Christian anti-Zionism I have, by and large, focused on God's continued calling and purpose of the Jewish people, rather than explore the thorny and emotive issue of the land, as so polemically expressed and analysed in today's media reporting of the Middle East conflict. My approach instead has been to focus on how God retains a plan and purpose for the Jewish people, that He has not finished with them, for which I believe one can make a pretty straightforward and airtight biblical case. There are some good books which do just this, for example R. Kendall Soulen's The God of Israel and Christian Theology and Mike Vlach's Has the Church Replaced Israel?
Interestingly, my experience among many Evangelicals not particularly siding with modern Israel (indeed even opposing her) is that, when presented with properly explained biblical arguments against supersessionism, they tend to be more sympathetic theologically towards the Jewish people. In the majority of cases this will then go on to have some bearing on how they perceive and re-explore the current Middle East conflict. After all, if God has not finished with the Jewish people, and around half of the world's Jews live in modern Israel, then it's no longer so easy to dismiss Israel as theologically insignificant or anachronistic. Thus my strategy has, by and large, been to focus on refuting supersessionism and letting the issue of the land take care of itself.
But, of course, ultimately the issue of the land cannot be avoided because it is so central to God's covenant with the Jewish people in the Old Testament (as well as lying at the core of much of the present conflict between Jew and Arab in the Middle East today). As such, refuting supersessionism is not enough. Eventually Christians will need to grapple with the biblical theology theme of the land and its bearing on God's continued plan and purpose for the Jewish people, together with the relationship between Israel and the Church.
With this in mind I want to draw readers' attention to Stuart Dauermann's blog, in which he posts a comment entitled A Grounded Theory on Israel's Right to the Land. Stuart, who studied at Fuller, is a keen thinker who tends to work through an issue via a series of blog posts, enabling him to explore the topic in some depth. Past series have been insightful and nuanced. I'm assuming, given his introductory comments on the land in the above post (the inductive approach of which I think readers will find really helpful) that he will be produce further posts exploring a biblical theology of the land. I sincerely hope so. Keep an eye on his blog for more on the land, particularly if you're uneasy with supersessionism but perhaps struggle with the issue of the land.