That God became man is not fantasy, not some random myth, but an actual, historical fact. We know that God became man; we know when God became man; we know where God became man; we even know how God became man.

All of these questions of what, when, where, and how that prudential historical research endeavors to answer are in fact all answered with regard to the Incarnation (the humanization, as it were) of God. 

George Washington crossing the Delaware…Julius Caesar crossing the Rubicon…Almighty God crossing the expanse between the divine and the human. Historical fact.