We should recognise that the song is new for the Summer Convention, not Christmastime . They have never contested the birth of Christ in Bethlehem so there is no reason to not sing about it .
However, I do agree that the words do sound Christmassy … I think in the past they would have avoided it . It will pass into their library of songs , just don’t choose it in December !
BTW … if you play the audio on the site .. it is pretty dire ..