Is there any word for "disobedience to God"?

Solution 1:

potentially :

sin and MW definition

noun:

1a: an offense against religious or moral law

1b: an action that is or is felt to be highly reprehensible

2a: transgression of the law of God

verb:

to commit a sin

It is not used to exclusively describe disobedience to God, but has those connotations:

It's a sin to waste food.

Bless me, Father, for I have sinned.

Ordinarily the sinful cleric prayed and fasted at his own discretion, and nothing is said of his confessing his sins.

Speaking as a AmE I tend to connect this to the Christian god, but that may be due to overexposure to Christianity, rather than actual usage rules.

Solution 2:

If you want to describe "disobedience" to the point of "rejecting God's authority", you should definitely consider "apostasy".

Merriam-Webster: https://www.merriam-webster.com/dictionary/apostasy

apostasy noun

apos·ta·sy | \ ə-ˈpäs-tə-sē \

plural apostasies

Definition of apostasy

1 : an act of refusing to continue to follow, obey, or recognize a religious faith

2 : abandonment of a previous loyalty : DEFECTION

Solution 3:

I'd like to add two options not yet mentioned, firstly 'impiety:'

A lack of respect, especially for God or religion.

(Cambridge.)

And secondly 'irreverence:'

The quality of not showing the expected respect for official, important, or holy things.