My issue here is likening the Gods to something that is physically contained within the Universe, such as a leprechaun or monster; when in reality the gods exist outside of, and encompassing all of our universe.
When you say "in reality", what you actually mean is "according to one particular definition of 'god'..."
A definition which, moreover, can't be verified or tested for accuracy.
Having said that, if this god is a theistic god (which is to say, he/she/it "intervenes" in observable reality), then that god has some kind of manifestation within this reality. A manifestation which should be detectable in some way, right?
If someone claims, for example, that god cured them of their cancer... curing a cancer is a physical process, right? It's a tumor that needs to disappear. Mechanics are involved in this. Wouldn't that then have to mean that this god, in some way, came into the universe and fiddled around with someone's DNA / cells / biology.
Why wouldn't such be detectable in some way?