^How is that any different? "Hope" is also an abstract concept, not related to direct experience, just like "faith".
I think Serris is on the right track here. There definitely is belief in the supernatural among LBT dinosaurs, but it doesn't have much in common with popular religions of today. There is a belief in spirits, the afterlife, there are legendary characters and ontological myths (telling of how things came about).The LBT dinosaurs have lifestyles similar to foraging societies, and these beliefs also remind of such societies.
However, what I think is interesting is that the beliefs are in a state of transition. For example, Grandpa and Gradma Longneck don't really believe in the stories they tell, meaning that the longneck myths are becoming a relic of the past. However, the belief in the circle of life still seems to be going strong. So, perhaps the longnecks are abandoning notions of concrete heroes and concrete important events in the past, and accepting an eternal world which constantly repeats itself, with nothing outstanding about it that is worth remembering from cycle to cycle. A transition from a linear view of history to a cyclical one.
There are also sceptical individuals like Cera, who appear not to believe in anything supernatural at all.