Obama said he wanted to “create a better dialogue so that the Muslim world understands more effectively how the United States but also how the West thinks about many of these difficult issues like terrorism, like democracy, to discuss the framework for what’s happened in Iraq and Afghanistan and our outreach to Iran, and also how we view the prospects for peace between the Israelis and the Palestinians”.

So far, so blah – President George W. Bush often expressed much the same sentiments.

But then, as is his habit , Obama turned the concept around. “Now, the flip side is I think that the United States and the West generally, we have to educate ourselves more effectively on Islam.

“And one of the points I want to make is, is that if you actually took the number of Muslim Americans, we’d be one of the largest Muslim countries in the world. And so there’s got to be a better dialogue and a better understanding between the two peoples.”

Obama said in Turkey that Americans “do not consider ourselves a Christian nation or a Jewish nation or a Muslim nation”. John McCain was criticised in 2007 for saying the US was “a Christian nation”, later amending this to “a Judeo-Christian valued nation”.

Of course, the concept of separation of church and state, which derived from the First Amendment to the Constitution, means that the US is not officially a Christian nation or a nation of any other particular religion. Which means, I suppose, that the US is as much a Muslim nation as a Christian one.

It’s a bold – some might say audacious – turnaround by the president.

It’s also a classically Obamaesque move.

During the 2008 campaign, he skillfully made himself, through his life story, the personification of change.

Now, implicitly contrasting himself with the born-again, evangelical Bush who pursued a post-9/11 “crusade” against terrorism, Obama is presenting himself to the Islamic world as the personification of a new, tolerant – and, yes, partly Muslim – America.

UPDATE: The excellent Don Surber crunches the numbers and points out that Obama’s claim is highly dubious. According to Surber, the US has an estimated three to eight million Muslims, less than one per cent of the world’s total and less than at least 23 other countries.

The average claim for the US Muslim population is about six million. The precise figure is difficult to get because it’s not included in US census data and many put the figure at much, much less.

But even if we assume there are six million Muslims in the US, that makes it only the 34th biggest Muslim country in the world – behind Indonesia, Pakistan, India, Bangladesh, Turkey, Egypt, Iran, Nigeria, China, Ethiopia, Algeria, Morocco, Afghanistan, Sudan, Iraq, Russia, Saudi Arabia, Uzbekistan, Yemen, Tanzania, Syria, Malaysia, Niger, Senegal, Ghana, Tunisia, Somalia, Guinea, Kenya, Azerbaijan, Kazakhstan, Burkina Faso and Tajikistan.

Debbie Schlussel cites a reputable survey by Pew that puts the number of Muslims in the US at 1.8 million. This would make it the 48th biggest Muslim country, after the above list plus France, Libya, Jordan, Israel, Turkmenistan, Uganda, Kyrgyzstan, Mauritania, Germany, Kuwait, Oman, Eritrea, Lebanon and Serbia and Montenegro – and just above Britain, which would be the 50th.