Grant Palmer does not believe in many teachings of Mormonism, such as the idea that the Book of Mormon is real history, and that the accouts of the first vision are true. Yet in his book, "An Insider's View of Mormon Origins", he says he is still a Church member and he believes that Mormonism is good because it promotes faith in Christ.

I don't understand how he could remain an active member if he doesn't believe in things as fundamental as the historicity of the Book of Mormon.

That book was written in 2002. Does anyone know if Palmer has been excommunicated, or is he still a member in good standing?

I can't imagine how they wouldn't have nailed his ass by now.

One can't be a Mormon and publicly declare that the Book of Mormon is fraudulent.

Here is the last paragraph from his wikipedia page:

Palmer stated in a Mormon Stories interview in 2012 that due to the publication of a two and half page article in 2010, "Religious feeling and truth", for an obscure Baptist journal in Kansas City, a second disciplinary council was scheduled but Palmer handed in his resignation before the hearing was held. Several reasons lead to his decision, mainly, that the first disciplinary council lasted an exhausting seven hours and he did not want to repeat that experience and also that the presiding authority of the second council let him know beforehand that to stay a member and avoid excommunication he would need to repudiate all of the details from his book and also regain his testimony of the church.[16]

He flew under the radar for a while to protect his family.

There are three segments here. It is in the final one that he tells about his resignation.

http://mormonstories.org/324-326-grant-palmer-returns-to-discuss-sexual-allegations-against-joseph-smith-william-and-jane-law-and-his-resignation/