The idea of Romantic Christianity is that we must and should move forward to a new era of consciousness - because consciousness is necessary for free agency.
We can be free only when we are conscious; insofar as the unconscious affects us without our awareness then we are not free.
So secular modernity is impossible, because it is not Christian hence basically false - and evil because it is by nature and intent totalitarian (Ahrimanic); mainstream Romanticism is impossible because it is not Christian, and aims-at the unconscious, instinctive, unfree, not-grown-up (Luciferic); traditional Christianity is impossible because it relies upon the objective efficacy of words, rituals, symbols, institutions that have become subjective and ineffective. And, anyway, we cannot go back to traditional Christianity because human evolution is developmental (thus irreversible - like an adolescent cannot become a child).
The fact that secular modernity, Romanticism and Christianity are all impossible does not, of course, prove that Romantic Christianity is possible - nor does it prove that Rom Christ would be desirable. The possibility and desirability of Romantic Christianity are firmly conjectural.
We should therefore be clear that there can be no publicly compelling proof that Romantic Christianity is what we must and ought-to have. So, in principle, we can only be Romantic Christians on the basis of 'evidence' that is personal individual, and - in that sense - 'subjective'.
However, Romantic Christianity includes the assertion that genuine subjectivity (intuition from of the real and divine self) is also objective, universal and eternal (objective, that is, within constraints of our perspective, experience and capability). True subjectivity is real objectivity.
In sum; to be a Romantic Christian is a matter of primary personal conviction. Either you have this, or you do not. If you don't have it, no evidence can convince you; if do have it, no evidence can disprove your conviction.
And such conviction can only be attained by consciously seeking it, and can only be apprehended by consciously knowing it and freely embracing it.
And if such is achieved; there is no more to be done with respect to proofs and evidence. One then Just Is a Romantic Christian; and our task and destiny then becomes (as I began by saying) incrementally to become conscious of all that is unconscious; to freely choose that which is spontaneously, intrinsically, naturally true.