In Romanticism the main determinant is the mood the atmosphere. And in that regard you could also describe Schubert as a Romantic.
We know that a man can read Goethe or Rilke in the evening that he can play Bach and Schubert and go to his day's work at Auschwitz in the morning.
Every song has a composer every book has an author every car has a maker every painting has a painter and every building has a builder. So it isn't irrational to take this simple logic a little further and say that nature must have had a Maker. It would be irrational to believe that it made itself.