Some ideas covered in another one of your posts:
See: What Did Jesus Really Mean by "Love Your Neighbor"?
are germane also to this topic, specifically, how is the word “Love” defined, or in this case, "how is the word “love” used in the song?
Since the same word can be (and often is) used to infer anything from the most sinful expression of the flesh, to the most rapturous expression of the Spirit, it seems some clarification is needed before your question can be properly answered. As it stands, the only answer to the question “Can a Christian Love Song Be Romantic and God-Honoring?” can be both “emphatically Yes” and “absolutely No”, and probably every shade in-between.
View from the Peanut Gallery
KP