That's an interesting statement. Only in the West, and only in the last few hundred years can religion be conceived of as a discrete object, separate from culture.
Indigenous American and Hindu culture, for example, have traditionally had no such division between religion and culture. With the rise of global capitalism we may be starting to see a secular/nonsecular divide in traditionally Hindu areas (India, duh) but this is a very modern development.
edit: I should say, none of the above necessarily negates anything you said. I just think it's interesting.
edit number 2: Also, the above could also be further illuminated in a short description of the differences between orthodoxy and orthopraxy. Worth checking out each concept on Wikipedia if y'all are interested.
Also, most of the major religions spread to different cultures a long time ago: A thousand years ago a Russian and a South Indian could have both not only been Christians, but both Eastern Orthodox, or an Indonesian and a Libyan could both be Sunni Muslims, or a Sri Lankan and Laotian could both be Theravadan Buddhists.
If people of disparate cultures could share common beliefs, sure religion and culture have always been separable. Especially pertinent to your examples are the South Indian Christians who have undoubtedly shared the culture of the Hindu majority for 2,000 years.
Furthermore, there are languages that still survive to this day that have no word for "religion" as such, something I talk elsewhere in this thread. This says to me that in some cultures religion cannot even be conceived of as separate from culture because the language does not provide the imaginative capacity to understand it that way.
So, always fluid, yes. Separable, I don't know.
Isn't that just a bias from watching too much discovery channel? We are used to seeing other cultures presented as being preoccupied with fancy rain dances, perhaps because they look good on television. But they must have a "normal day routine", too, which I would consider to be culture as well? It might be the "bag of rice in china phenomenon" - mundane daily life might not make for interesting movies, so we disproportionally often get to see special events from other countries.
However, I think you are focusing too much on religion as ritual specifically. Yes, indigenous Americans, for example, have certain rituals, rites, and special events that stand apart as specific expressions of their unique culture. If those rituals seek to connect the individuals who participate in them, and the community as a whole to an "ultimate reality" or an unseen world, we in the west call it a religious ritual. Most indigenous American people (all, as far as a I know) do not even have a word for "religion," however, so the mundane and the "fancy rain dance" are each simply forms of culture with no defining boundary.
I read the magazine since I was about 8 years old (24 years ago). They used to do top-notch invetigative journalism. Over the course of my lifetime I could wittness a big decline in quality.
There's a difference between culture and religion. Having a 10th-century depiction of the crucifixion in my passport doesn't imply that I'm religious, but it does remind me that I come from a country with a long and rich history and culture. In Northern Europe religious artifacts are primarily seen as cultural heritage, not as a way of showing your devotion to a god. I can't speak for Southern Europe, but from my limited experience of living there it doesn't seem very different.
"American church attendance and religious belief is not off the European scale if one compares it with Europe's Catholic regions. A smaller percentage of Americans consider themselves religious than the Portuguese and Italians. Proportionately fewer Americans say they believe in God than the Irish and Portuguese."
The article compares all of America to a small very religious part of Europe. That would be like saying that Americans produce 20 times as many cars as Europeans because the average number of cars produced per capita in Detroit is far above the average number of cars produced per capita in Europe.
The US is the country with the smallest percentage of non-believers (3%), and as stated in the article Portugal and Italy aren't far behind(4% and 6%). The article doesn't however mention Sweden or France that are 46% and 43% non-believers.
Source: http://www.swivel.com/graphs/show/8244121
Spiegel should really know better than manipulating numbers like this.