Saint Peter the Aleut, or Chukagnak, was supposed to have been a man from Kodiak forced to labor for the Russian-American Company and brought to California. According to his colleague Kyglaia, in 1815, Chukagnak was tortured to death by a Spanish mission priest because he refused to become a Catholic. He is venerated as a saint by at least some parts of the Eastern Orthodox Church. The story has been endlessly disputed.
Are there more recent saints (i.e. since 1815) of established religions whose very existence is in doubt?