Gregg Allman was always religious in a quiet way, but he never told whether his religion was Christian or something else.
Allman was averse to organized religious beliefs and systems, but he always believed in a god. However, in the latter stages of his life, he stated that he had discovered his form of Christianity and began wearing a cross necklace.
In his memoir, he stated that he found a spiritual soul and was never alone. He had his kind of faith, just like other people. He described his way of believing in god in his way.