Unfortunately the core argument of this is fallacious for the following reason: I can imagine any number of impossible things such as, for example, a million invisible insubstantial eternal chickens dancing on my keyboard in front of me. But I don’t need to disprove anything. I can simply observe that there are no real-world phenomenon that would be explained by invoking such chickens, therefore they are logically redundant.
Gods of all sorts likewise answer no real-world questions. Even the most obvious question of “where did the universe come from?” is not answered by invoking one or more invisible magical entities because this is merely a pointless regression: one then asks, “where did these gods come from?” If one answers “the gods were always here” then one may as well say “the universe was always here” because invoking the gods does not actually answer the posited question nor provide any mechanism for doing so.
Hence atheism is not a disbelief in gods; atheism is a coherent intellectual approach to attempting to understand the real universe in which we live. Coherent intellectual approaches do not posit unnecessary phenomenon. Hence I can discount the existence of my invisible magical chickens and utilize my time for more productive investigations of real phenomenon and likewise can discount the existence of any number of gods, goblins, ghouls, or ghosts.