Meaningfully. I don't believe in the existence of Atlantis, but can use the term in a sentence properly.
I don't believe in Atlantis either but I can also use it within a standard English sentence meanigfully - that's because there's a more or less unified, coherent definition of the word. This doesn't apply to gods.
Please would you give us the important ones.
1. It's predicated on monotheism - that if any gods exist there's only the one of them. Not every theist is a monotheist.
2. It omits deism, for example - deists believe in a God who was the creator of the universe but can't be said to be the ruler of it thereafter.
3. It omits maltheism/dystheism - those who believe that a god exists but is not the source of moral authority in being actively malevolent.
4. Perhaps most tellingly, it omits the fact that there almost as many definitions of a god as there people who believe in such things. Conduct a poll with a sample size as large as you like and you'll get any number of different definitions of a god, of which the OED is just one. It may well be the most prevalent one amongst monotheists especially, but that just makes it common, not true.