From the Oxford English Dictionary:
Forms: Also 15 in Greek-Latin form theomachia /θiːəʊˈmækɪə/.
Etymology: < Greek θεομαχία, < θεός god + -μαχία fighting.
1. a. A striving or warring against God; opposition to the will of God.
I first came across the word “theomachy” reading about the titanomachy–the uprising of the titans against the Olympian gods. But the word immediately made me think of “striving or warring against God” as a human activity, and from there to consider Genesis 32:23-32:
And when all things were brought over that belonged to him, ‘ He remained alone: and behold a man wrestled with him till morning. ‘ And when he saw that he could not overcome him, he touched the sinew of his thigh, and forthwith it shrank. ‘ And he said to him: Let me go, for it is break of day. He answered: I will not let thee go except thou bless me. ‘ And he said: What is thy name? He answered: Jacob. ‘ But he said: Thy name shall not be called Jacob, but Israel: for if thou hast been strong against God, how much more shalt thou prevail against men? ‘ Jacob asked him, Tell me by what name art thou called? He answered: Why dost thou ask my name? And he blessed him in the same place. ‘ And Jacob called the name of the place Phanuel, saying: I have seen God face to face, and my soul has been saved. ‘ And immediately the sun rose upon him, after he was past Phanuel; but he halted on his foot. ‘ Therefore the children of Israel, unto this day, eat not the sinew, that shrank in Jacob’s thigh: because he touched the sinew of his thigh and it shrank.
Striving against God, then, does not seem necessarily a sinful activity; but how it can be not sinful perplexes me. And so I do not know exactly what to make of theomachy, even as I find myself focusing in on images of it.