Patton was born an Episcopalian. He converted to Catholicism at some point, maybe when he married. What he actually believed is a good question, other than that he may have believed in reincarnation.
And then there is his famous Christmas 1944 prayer:
On Dec. 8, Patton turned to a higher power to clear the skies. He asked Chaplain James H. O’Neill if he knew of a “good prayer for the weather,” according to military historian and Patton expert Kevin M. Hymel. “We must do something about these rains,” Patton said, “if we are to win the war.”
After some thought and research, O’Neill came up with the following:
“Almighty and most merciful Father, we humbly beseech Thee, of Thy great goodness, to restrain these immoderate rains with which we have had to contend. Grant us fair weather for Battle. Graciously hearken to us as soldiers who call upon Thee that, armed with Thy power, we may advance from victory to victory and crush the oppression and wickedness of our enemies, and establish Thy justice among men and nations. Amen.”
O’Neill typed the prayer onto an index card, and on the flip side typed a Christmas greeting from Patton. Patton ordered 250,000 copies of the card printed and distributed to every man in the 3rd Army.
Throughout history, soldiers have called upon their gods for protection and victory over their enemies. But Patton’s now legendary prayer was extraordinary in its presumption and audacity, said Hymel. “There were four other American commanders in the European Theater during that time, and none of them were asking God to fix the weather.”
"L'audace, l'audace, toujours l'audace."
Some in a younger generation of Patton’s family became Roman Catholic. One is a grand daughter who is a nun at the Abbey of Regina Laudis at Bethlehem, CT. I don’t think that Patton ever converted from being an Episcopalian. As a Catholic, I wish he had but he certainly was a believer in Christianity and prayed fervently to our Father in heaven and regularly. Like all of us, he was a sinner. He was also our greatest battlefield commander of the 20th century. His military relatives who were, to the best of my knowledge, Episcopalians as well, included Light Horse Harry Lee (Revolutionary War), Robert E. Lee, George Washington, Arthur MacArthur, Douglas MacArthur, “Chesty” Puller of the USMC (Guadalcanal and Chosin Reservoir) and others of great note. May their souls and all the souls of the Faithful departed, rest in peace!