Today my position is that though I admire much in Christianity, I am unable to identify myself with orthodox Christianity. I must tell you in all humility that Hinduism as I know it, entirely satisfies my soul, fills my whole being and I find a solace in the Bhagavad Gita and Upanishads that I miss even in the Sermon on the Mount.
Source, in full
Vol.27 p.2 04-06.28 July, 1925 Speech at a Meeting of missionaries (Y.M C.A. Calcutta) Mahatma Gandhi, The Collected Works, Volume 27, New Delhi, 1968, p. 435, (also quoted in Goel, S.R. History of Hindu-Christian Encounters (1996))