Atheism is the assertion that there is no God, agnosticism is the acknowledgement that we can’t actually prove such an assertion
Most atheists tend to identify as agnostic atheists. You’re arguing against gnostic atheists, which are few and far between in my experience. The qualifier is usually dropped out of simplicity.
I’m gnostic about the Judeo-Christian god existing, and agnostic about any god existing. I still identify as an atheist.
Are we talking Star Was Holiday Special bad, or is it the sort of thing you could watch while laughing at it? Because my friend has a big weed stash and needs to know about movies like that.