Final answer:
The agricultural calendar is relatively unimportant to atheistic religions, which do not involve supernatural beliefs and therefore have less reason to be aligned with agricultural cycles unlike monotheistic, polytheistic, or animistic religions.
Step-by-step explanation:
The agricultural calendar is known to be relatively unimportant to atheistic religions. While animistic, monotheistic, and polytheistic religions might incorporate agricultural practices into their belief systems due to historical reasons such as the reliance on successful harvests for community survival, atheistic does not concern itself with the supernatural and therefore has less reason to be aligned with agricultural cycles. For example, the historical emergence of religious elites in agricultural societies often came with an increased focus on fertility deities and rituals, which would not have a place in atheistic belief systems.