People nowadays are granted far too much time to let their thoughts wander, dwell on their circumstances... even too much time to question "why?" If actual survival were more imperative in our daily lives I can gaurantee that "faith" would more often take a backseat to more pressing (and, in my opinion, far more important) matters.
I disagree; animism, the kind of religion that most hunter-gatherers and other indigenous peoples practice/d, is rooted in the very pressing matter of survival in an environment shared with other-than-human persons who can help or harm, who can eat or be eaten. Proper relationships and rituals help the ensure balance in the system of relationships.
Now then, studies have shown that among indigenous peoples, whether hunter-gatherers, fishers, farmers, or some combination, the pressing hard work of survival actually only takes up about half of a waking day on average for a healthy adult (and not everyone has to spend all of every day working for the group to survive), so that there is plenty of time for socializing...which includes storytelling, singing, dancing, thinking (including about "beliefs"), discussing all sorts of matters, doing "art" (which among indigenous peoples is almost always associated with the relationships between people and other people, or with the other-than-human persons they interact with). Societies structure time around their survival activities, as well as around socializing--and that can and does include rituals that can be described as "religious."