The Confessional Statement of The Gospel Coalition is, in my opinion, strikingly wise. (Needless to say, I didn't write it.) On the one hand, the Confession does not call us to unity on a slender theological basis, to increase the numbers of people involved. On the other hand, it does not pressure us to agree at such a level of detail that we might jeopardize denominational identifications. The statement is theologically maximalist within a gospel framework.
I think of concentric circles. Stepping from outside the circle altogether into the outermost ring, I go from being a non-believer to being a Christian believer. Then, moving into the next ring, toward the center, I go from being a Christian in some sense to being a Protestant. Then the next step toward the center moves me from being a Protestant to being an evangelical. Then the next step includes me among the Reformed. Finally, the innermost circle locates me personally within Presbyterian theology. But I could also be reformed Baptist, Anglican, etc.
The point is this. Defining our theology as gospel-maximalist makes unity a conviction, not a concession. I am not compromising the gospel by aligning myself with a reformed Baptist, for example; I am demonstrating the gospel. My ministry at The Coalition -- and at Immanuel Church -- is not defined by my own personal beliefs at the level of that innermost circle but at the next circle, the Reformed circle. I am not watering anything down. I am humbling my own personal views for the sake of the "of first importance" (1 Corinthians 15:3ff) gospel we all share together. And that is a conviction.
This strategy builds theological density and seriousness, while including a broad range of gospel-intense men and women.