As an alternative way of conceptualising Romantic Christianity, from that summarised earlier today; there is an approach based on the modern condition and the need for a direct and personal (unmediated) kind of Christianity.
The modern condition is that the Christian tradition is distorted and destroyed, and over-complexified, and layered-upon by so much disinformation; all to such an extent that a typical individual has no way of discovering (short of a prolonged and strenuous quest) what Christianity actually is.
In effect - actual, detectable, accessible Christianity might as well not exist for all the help it is to becoming a Christian. Indeed, it is likely that the culturally dominant 'Christianity' does a great deal more harm than good, in terms of understanding real Christianity.
Assuming (as I do) that this actual world is well 'designed' by God for its purpose - is indeed 'tailored' to the specific needs of you and I and each other person - then the possibility arises that modern Man must become a Christian primarily from his own personal experience. And that God has made this possible for everyone.
In other words, that the kind of Christian we are called to become, is the kind of Christian that a person might become in response to a very simple personal yearning having a direct encounter with the divine.
For Christians, this encounter needs to be one that will lead us to love, believe and follow Jesus through (biological) death and into everlasting Heavenly life beyond.
This means that we ought to be able to learn this from some kind of directly experienced encounter with reality - this encounter would need to be sufficient in and of itself, because the likelihood is that any cultural Christianity would not help, but on the contrary would confuse or contradict it.
This would also mean that the direct experience of knowledge of Jesus would need to be self-validating. (Because culture would not validate it, there could be no cultural 'evidence' for our experience - thus the experience would need to stand-alone and without further 'proof').
This, then, is another 'definition' of Romantic Christianity: that Christianity which any individual could attain to for himself and unaided.