Funny, I've never met anyone who used that term to apply to themselves.
However, there are a lot of people who hold to the traditional Christian doctrine, which is correctly called "covenant theology". You know, it's the idea held by a billion Catholics, 300 million Orthodox, all of the Reformers, and all Protestants prior to about 1820? That's a lot of folks to cavalierly dismiss.
And claiming we think "God is finished with Israel" is nonsense. National Israel was the prototype of international Israel, which is the Christian church. And God will, in his own time and manner, graft the "natural branches" back into the one olive tree.