A saying that came out of the trenches, or foxholes, of World War I was, "There are no atheists in foxholes." Henry, who sees the world as a bitter realist, does not love God. However, he is not above turning to religion in times of crisis, as can be seen in the St. Anthony medallion he puts under his shirt before going into battle or his moving, desperate prayer when Catherine is dying. While Henry never becomes a conventionally religious man, he does follow the advice of the priest and Count Greffi, who in separate conversations outline a sort of humanist theology for Henry: he should commit with religious devotion to the person he loves, who is Catherine. Even this personal form of religion, however, fails Henry in the end.
Religion ThemeTracker

Religion Quotes in A Farewell to Arms
"I am afraid of Him in the night sometimes."
"You should love Him."
"I don't love much."
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