The Song of Songs, which is Solomon's, is clearly an expression of what inspired the very creation of masculinity and femininity.

It is the mystery of Christ and the Church.

No, it is not 'incoherent'. There is a structure to the book and a development in the narrative. The book is educated, informative, sensitive and moving. 

Yes, it is inspired. The full meaning of the book is revealed in the New Testament scriptures and in the Book of Revelation which parallels the concepts of Christ and the Church seen, in prophetic imagery, in the Song of Songs.

There is  nothing lewd or indiscriminate about the love being expressed. It is nuptial, not licentious. It is about a marriage, not an affair. It is about a lifelong bond of union that wishes it had always been so.

Unto the pure, all things are pure, Titus 1:15.

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Ten years ago, I put the entire book into English verse so that it may be read as poetry and parts may be sung in worship.

This may be freely downloaded from my website. It is part of the book ['The Songs of the Witnesses'][1]


[1]:https://belmontpublications.co.uk/verses/