I hadn't really intended to get into this at all. But, well, I suppose I owe a response. Let's not re-invent any philosophical wheels here, though. You might kick off with Stanford - there's a good survey piece there by Michael Tooley: The Problem of Evil.
(Generally I suppose I'd thought of Plantinga vs Mackie as a bit of a sideshow; it's not really my field (although, sure, everything is connected). But, anyway, look ...)
"Plantinga’s view," Tooley asserts, "... is very implausible." (1.3), in that it "ignore[s] the most plausible and challenging versions of the argument."
Tooley then goes on to give a valid proof of the conclusion "God does not exist" (1.4) focusing on, as he says, "... quite concrete types of evil", which wholly sidesteps Plantinga's strictures on Mackie. He (Tooley), then suggests how we might make the argument sound by replacing axiological premises in it by appropriate deontological ones.
(Personally I suppose I'd like to try to do it more on a virtue-theoretic basis, but anyway Tooley's thing works on its own terms, for sure. (He even gives a formal proof of validity: No God Proof, which may be fun for any neophyte logicians reading the thread.))
So there's a way Epicurus' proof can be maintained, if you like.
As I said earlier, the point at issue just here is not the status of any given proof. It's really just that the (I reckon mostly unthinking) response of "Well, we can't prove matters either way ..." is mistaken.
Such a response, in my experience, can tend to lead to a kind of lazy relativism, in which answers to questions such as "Is there such a thing as gender identity (or god, or immortal souls, guardian angels etc.)?" end up seen as a matter of taste, to be answered whimsically if at all, rather than as matters of fact to be answered by ... well, by reason and/or experience, if you like: rationally, anyway.
Such whimsy, in case it's not clear, is bad. Bad for the individual and bad for society.
Try to get reasons for your beliefs, if you can. Of course, if you can't, it may be agnosticism is a sensible point of view. But even then, don't give up trying to find decisive reasons one way or another.
(Sorry that's a bit preachy. But, well, it's what I believe. You may disagree.)
Oh, and there is no such thing as gender identity. No matter what some people think, that's a fact. And humans can't change sex. Another fact.