When I first entered the music debate (after attending an ifb class) the thing that I found most ironic was that with all the talk of "worldliness", and all the scriptures quoted ont hat taken to mean that a song shouldn't even "sound like" "the world"; not only were the four main national anthems:
Star Spangled Banner
America the Beautiful
My Country Tis of thee, and
God Bless America
acceptable; they were in many hymnals! Of course, they were of the basic "traditional hymn" form, but to include them as "sacred" music while a modern worship song was "worldly" because it had a backbeat or too much syncopation was ridicoulous, and betrayed the utter cultural issue the ifb position is!
Those are secular songs! Basically "hymns of praise" to a human country, that only "mention" God, and His supposed role in it, but more like a national mascot, as many did in practice take Him for.