For some years Morris was a religious skeptic. His parents were of the Baptist faith. But in 1813, when Thomas was converted to the Christian faith, he united with the Methodist Episcopal (M.E.) Church. Thomas was licensed to preach 2 April 1814 and was ordained circa 1820 by Methodist Bishop Robert Richford Roberts. After serving as a Supply Pastor on a Methodist circuit, the Rev. Morris was admitted into the newly formed Ohio Annual Conference of the M.E. Church, September 1816.