Why would someone invent a hymn against his held doctrine? It happens all the time. Let's take for example:

Quote
Thy Works, Not Mine, O Christ by H. Bonar
Thy cross, not mine, O Christ,
Has borne the awe-full load
Of sins that none could bear
But the incarnate God.

Rev. Bonar was a minister of the Free Church of Scotland. I could sing that hymn in a Lutheran church but not in a Presbyterian church.