It's interesting that the vast majority of "unaffiliated" identify themselves as "nothing in particular" as opposed to atheist or agnostic. At the same time there are large numbers of unaffiliated who attend worship services at least occasionally, who pray, who identify themselves as "spiritual", etc. Yet most, 88% according to the study, are not "looking for a religion that is right for them".
Even more interesting is that when it comes to such beliefs and practices as astrology, reincarnation, and yoga there is no difference between the unaffiliated and the general US public - most of whom are affiliated. That suggests that the churches are not clearly preaching and teaching true Christianity. It would seem that most of the unaffiliated have never seen true Christianity - by which I mean that taught by the Apostles and handed down faithfully through the centuries in Orthodox Christianity.
(And yes, I would expect that these trends are very similar here in Canada.)