Is saying to one's wife, "My heart and soul are for you," or describing the homeland as "your sky, your wind," and "the mother," considered shirk (polytheism), knowing that the songwriter is Hindu?

There is no objection to a husband saying to his wife, "My heart and soul are yours," as this is intended to express love and good companionship, and does not imply actual ownership. The letter "lam" (ل) here denotes exclusivity, not merely ownership. Similarly, there is no objection to attributing the sky and wind to a town, such as saying "its sky is clear," as the attribution here is to the place, and this is a common usage in people's speech. Likewise, there is no objection to calling one's homeland "the mother," which is a common expression in literature and poetry, signifying the origin from which a person emerged. This has no connection to deifying the homeland, even if other cultures use it for different purposes. It is advised to avoid obsessive doubts and suspicions in such matters.