A friend recently shared a devotion with me from Deeper Walk. The October 17, 2016 page was written by a romance author (unnamed) who said, "Many people viewed her scratchings as 'fluff.'" But the author defended her writing by concluding after prayer and Bible study that God is a romantic!
When he saw how lonely Adam was he created Eve. "Then the Lord God said: 'It is not good for the man to be alone. I will make a helper as his complement'"(Genesis 2:18).
I would add that God was interested in finding Isaac the "right" girl and indicated that she would be the one who offerred to water his camels which is exactly what Rebecca did. Jacob, later called Israel, was so in love with Rachel that he worked a total of 14 years for her father, who first tricked him into marrying Leah, but later gave him Rachel as well. And what about the patriarch Abraham. His wife Sarah's name meant princess. No one can argue that Song of Solomon is not one of the most romantic and poetic books in the Bible. And Jesus uses the analogy of the groom returning for his beloved bride to describe his second coming.
If you feel called to write Christian romance, do not be ashamed that you are not writing deep theology or delving into erudite explication of Scripture. Write from a basis of knowlegde of God's word, experience, and heartfelt emotion.