Theodore J. Kisiel, an engineer and philosopher, now teaching at Canisius College, was an Assistant Professor at the University of Dayton when he offered this interesting response to Father Elbert's views on existentialism. The points at issue are worthy of further dialogue.
Kisiel, Theodore J.
"The Atheism of Heidegger, Sartre, and Thomas Aquinas,"
University of Dayton Review: Vol. 1:
2, Article 4.
Available at: https://ecommons.udayton.edu/udr/vol1/iss2/4