What does the first stanza of "Some Keep the Sabbath Going to Church" suggest about the speaker’s view of religious customs?

The speaker contrasts people who go to church on the Sabbath with her own way of observing it: she stays home and has a bobolink as her choir and an orchard as her church dome. This shows that she participates in a religious custom in an unconventional way, rather than rejecting the Sabbath altogether. The nature imagery describes how she worships, but the main point is her unconventional observance.

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