I describe myself as a Romantic Christian - and in this usage 'Romanticism' has a precise meaning of 'knowing by direct personal experience'.
My contention is that the era of Romanticism in The West (beginning in the middle 1700s) is that we need to know By Personal Experience. That must be the foundation of our lives.
Other forms of knowing - e.g. from authority, by tradition, from philosophy or science, or from any external source, may be helpful, but these cannot be the basis of life.
Romanticism is a development of human consciousness; it is ordained by God as part of the development of each Man and of Mankind. It does not apply to all eras, nor to all Men, nor to all cultures - but when it does apply it is unavoidable.
It applies to me, and almost certainly it applies to you. We must seek knowledge in our personal experience - else we will not really believe it, will not be sufficiently motivated by it, will not be engaged by Life, will not be part of Reality: and we will lapse into nihilism and despair (indeed, most people are already in that state).
Since Christianity is true - the implication is that modern Western Christians will nearly always need to know by their personal experience; and will ultimately need to do so. Other sources of knowledge will not suffice (although they may help).
This is Romantic Christianity: the recognition that modern Western Christians (nearly always) need to have faith by their direct, personal experience of the grounds for faith.
It is not that church, scripture, tradition, philosophy &c. are obsolete - but that they cannot be the basis of Christianity any more, for you and me. And cannot means cannot - we must seek direct experience if we are to be sufficiently real Christians in this time and place.