The myth of Mecca?

Any truth to this: The Myth of Mecca?

Also, from Spencer, Robert. The Truth about Muhammad. Washington, D.C.: Regnery, 2006. 31:

Spot on? Really wacky? Somewhere in between?

Google turns up a lot of chaff and little wheat

There are several people who claim that Muhammed did not exist, and that Islam developed independent of a single guiding founder. You can read about some of them and their theories in Ibn Warraq’s book Why I am ot a Muslim:

I get the clear impression that ibn Warraq (a pseudonym) doesn’t buy this line of reasoning, and I don’t either. On the other hand, the earliest accounts of he Prophet’s life were written by True Believers, and that makes me suspect their complete veracity as much as I do the work of any True Believers, including Christians.
Quite a few religious founders have had their existence doubted. We frequently rehash the existence of Christ on this Board (and there are a quite a few books arguing the topic), and of Buddha, and quite a lot of people doubt the existencve of Lao-Tse. I haven’t heard of doubters of Moses, Abraham, Zoroaster, and Confucius, but doubtless they exist, too.

As far as mainstream consensus goes, Lao Tse, Moses and Abraham are regarded by most historical scholars as purely mythical characters but Jesus, Buddha, Mohammed and Zoroaster are still, on balance, regarded as probably historical but that they’re buried under so many layers of myth it’s hard to know much about whatever authentic personalities lie at the roots of those legends.