Xtianity en · NOUN
Etymology
First use appears c. 1634, from Christianity, replacing Christ with the abbreviation Xt (from Ancient Greek Χ (Kh, the letter chi), the first letter of Χριστός (Khristós, “Christ”) + t, the last letter of "Christ"). Compare the more common Xmas. By surface analysis, Xtian + -ity.
Meanings
-
(alt-of, alternative, uncountable) Alternative form of Xianity (“abbreviation of Christianity”).
alt of Xianity
I believe Buddhism to be a simplification of Hinduism and Islam to be a simplification of Xtianity.
1950 December 14, C. S. Lewis, Letter to Sheldon Vanauken: