Why is it that so few Europeans believe that diabetes can be cured via prayer? Is it that state-run religions aren't as market-savvy as the "free-market" churches in the US? Are Europeans better educated? I presume the author probably is also referring to an embrace of creationism as well. What is it that went right in Europe (or just didn't go awry)?
People whose religion is sincere will inevitably come into conflict with religious and secular authorities from time to time. Over several centuries, most of them left Europe and went to the US, where there were no religious authorities, and the secular authorities were much more hands-off. It's not particularly surprising that their descendants still take religion seriously.