Every culture's spiritual life differs in dogma, ritual, and celebration, yet all great religions flow from the same fundamental source, interpreted and filtered through each culture's unique lens of time, place, and worldview. Because human consciousness cannot grasp the deepest truths in full totality, each culture weaves its symbolic stories and rites as hints and signs pointing toward the body of spiritual truth which lies beyond the power of word and symbol to express.
Every human culture has a spiritual element.
In other cultures, particularly modern western culture, religion is held as a discrete aspect of life, with worship services held at specific times and places while the separation of church from state is inscribed in law. Everyone has a religion. Everyone carries a philosophical framework or worldview which organizes and gives meaning to life. If a religion's longevity reflects its degree of harmony with the deeper truths, then the mechanistic worldview, several centuries old and collapsing under the ineluctable march of quantum physics, is revealed as grossly disharmonious with the truths which have sustained the world's great religions for millennia and animate them still. As mentioned, any time a deep truth is reduced to words it necessarily loses its power, becoming a symbolic truth rather than an experienced truth.