I don't see why you would say that if you know Scripture. Its music and is supposed to be artistic as a result but I find the song, save a line or two or portion thereof) fairly well done for contemporary Christian music that is broadly appealing across denominations.
My eschatological position seems to fit with this song.
In Scripture (the sword of the believer is Scripture Ephesians 6:17), we don't know when Christs return will be, but until He returns we have the Christian life to live out in a world that hates us, because they hate our Lord and Savior.
This is our battle. We are "holding the line" as Christians sending forth the Gospel as we go.
The Apostle Paul was very happy to use warrior type language for living out the Christian faith so the language is quite in keeping with apostolic language use to stir people to faithful living in the face of adversity - which abounds all around us, and in us as we often battle our own sinful weakness.
My eschatological position is Amillennial, meaning I see the entire church age as the tribulation that begets the multitude that cannot be numbered. So "holding the line" until Christ's returns makes perfect sense and is to me in keeping with the Spirit of the Word, though I might change a few things a little I don't see the song as offensive..