messianism
noun
mes·si·a·nism ˈme-sē-ə-ˌni-zəm 
mə-ˈsī-ə-,
me-
1
: belief in a messiah as the savior of humankind
2
: religious devotion to an ideal or cause
Example Sentences
Recent Examples on the Web But there was also an element of historical messianism in Putin’s thinking, a pseudo-philosophical strain that ran far deeper than concerns over Western armaments. 
The New Yorker, 12 Mar. 2022 My criticisms of López Obrador’s political messianism have been public since 2006. Enrique Krauze, The New York Review of Books, 24 Sep. 2020 Take the all-quadrant pandering and formulas of old-school network TV, add in the messianism of a telethon, and swirl in some Reddit-friendly raunch and crassness, and set it all to hyperspeed. Spencer Kornhaber, The Atlantic, 11 Apr. 2020 Republican and conservative politics of late has had its own version of messianism, expressed as rage at the party’s Washington establishment of Mitch McConnell and Paul Ryan, or as refusal to be associated with the Trump presidency. Daniel Henninger, WSJ, 20 Dec. 2017
The New Yorker, 12 Mar. 2022 My criticisms of López Obrador’s political messianism have been public since 2006. Enrique Krauze, The New York Review of Books, 24 Sep. 2020 Take the all-quadrant pandering and formulas of old-school network TV, add in the messianism of a telethon, and swirl in some Reddit-friendly raunch and crassness, and set it all to hyperspeed. Spencer Kornhaber, The Atlantic, 11 Apr. 2020 Republican and conservative politics of late has had its own version of messianism, expressed as rage at the party’s Washington establishment of Mitch McConnell and Paul Ryan, or as refusal to be associated with the Trump presidency. Daniel Henninger, WSJ, 20 Dec. 2017 Word History
Etymology
French messianisme, from messie messiah + -anisme (as in christianisme Christianity)
First Known Use
1867, in the meaning defined at sense 1