Disregarding them simply because they're not mainstream in our parts of the world is hardly an excuse to conflate them with theistic religion. It's just argumentum ad numerum.
That's also, itself, a microcosm for your argument. You're conflating a specific type of religion, perhaps sadly common where you're from, with all religion everywhere. You hyperbolically speak "billions of religions", but continually only ever describe one of them as if it represented them all, when it doesn't. You recognize that there's (not hyperbolically) hundreds of different religions, but how many could you actually name and accurately describe in your own words and off the top of your head?