First of all, it's Church of the Incarnation in Irving on the University of Dallas campus. There's another Church of the Incarnation in Dallas. But for visitors who have never been to UD, take a look at the map (link below) to see where on campus the church is located. I recommend parking near the soccer fields and walking up behind the gym.

http://www.udallas.edu/visitors/zz_art_docs_images/0422_campusmapshrine_fy15_update.pdf