What? Not "a difficult concept to grasp"? You feel you "grasp" (as opposed to believe) the concept of the infinite, eternal, almighty God becoming incarnate in an obscure Jewish girl, member of an obscure and not especially prepossessing tribe? You "grasp" the meeting of Time and Eternity? The Arians and Nestorians (and probably others) had a great deal of trouble grasping it.
The Incarnation has nothing to do with the fables and lies Rome has concocted -- such as Mary being sinless; her supposed bodily ascension into heaven; her immaculate conception; her co-redeemer status, her crown as queen of the universe, and all the other idiotic, unScriptural, blasphemous titles and characteristics Rome heaps with abandon on a simple Jewish girl.