Kurtz wanted to unite (if that's the proper word) the various disparate skeptic and atheist groups and individuals into a coherent movement that promoted secular humanism. In this he largely failed.
The reason he failed was that he didn't just want to unite them...he wanted to unite them with himself as unquestioned leader. He had his own vision about how to do things, and a very strong "if you're not with me, you're against me" attitude towards anyone who disagreed with him, or had other ideas.
About ten years ago, we were talking with his organization about gaining their support to help establish a Chinese skeptical organization. He informed the Chinese organizers in no uncertain terms that gaining his support meant that they were not allowed to cooperate with or form alliances with any other organizations, and that doing so would mean immediate cessation of support from his organization. He also demanded that the Chinese organization had to be run according to his ideas and principles. The fact that China has an entirely different culture, an entirely different political climate, and perhaps most importantly, entirely different issues, meant nothing. The worst part was that if you
didn't agree with him, he not only would refuse to work with you, but in some cases took active steps to oppose the work you were doing. (Witness the case of CFI, where after he stepped down as the leader of the organization, and they started doing things he disagreed with, he tried to convince donors to stop supporting their work)
He may have had the
goal of uniting everyone, but his methods were one of the main reasons for some major
schisms in both the skeptical and the secular Humanist communities. His vision of "unity" was one with him as unquestioned leader...a vision that was never going to happen, and that I found quite perplexing in a man who generally called for others to question their leaders.
Like I said, there's a great deal to respect in what Kurtz did, and he was unquestionably a critical element in establishing the modern skeptical movement. But he also had some fairly major personality flaws that ultimately damaged much of what he wanted to do. We may have been able to benefit in China from his support...but the conditions he attached to it made such a cooperation essentially impossible.