deicide
noun
de·i·cide ˈdē-ə-ˌsīd 
ˈdā-ə-
ˈdā-ə- 1
: the act of killing a divine being or a symbolic substitute of such a being
2
: the killer or destroyer of a god
Example Sentences
Recent Examples on the Web The heroes must battle against Gorr the God Butcher, a warrior on a mission to enact trans-universal deicide, played by Christian Bale. 
Joe George, Men's Health, 8 July 2022 The church eliminated doctrines of deicide and supersessionism, while issuing formal apologies for Christianity’s role in centuries of persecutions. WSJ, 13 Feb. 2022
Joe George, Men's Health, 8 July 2022 The church eliminated doctrines of deicide and supersessionism, while issuing formal apologies for Christianity’s role in centuries of persecutions. WSJ, 13 Feb. 2022 Word History
Etymology
ultimately from Latin deus god + -cidium, -cida -cide — more at deity
First Known Use
1577, in the meaning defined at sense 1