I'm pretty wary of these kinds of polls -- as they point out themselves, "these data only compare the importance of religion in people's lives -- they say nothing about what being highly religious means in different parts of the world and among different faiths" -- but I found it interesting nevertheless.
|Are Americans among the most religious people in the world? The answer depends on which "world" you're talking about. If you're referring to the entire planet, the answer is plainly "no." In 2006, 2007, and 2008, Gallup asked representative samples in 143 countries and territories whether religion was an important part of their daily lives. ... Across all populations, the median proportion of residents who said religion is important in their daily lives is 82%. Americans fall well below this midpoint, at 65%.