Aren't the two you listed rather cultural specific? Isis being Egyptian and Dionysus Greek? I guess you could counter that each religion is rather cultural specific, though less so with the more advanced monotheistics such as Christianity and Islam...
All are, including the latter day monotheistic ones. The uniting language of Islam, for example, is Arabic, no matter which country is considered: Indonesia, Pakistan, Algeria, or the US. Christianity is actually a bunch of religions, but Latin still rules in the Roman Catholic Church, while the religion itself is an (at times) uneasy mix of Habiru-based triumphalism and exclusivity, and late Greek neo-platonism. I mean to give no offense to anybody in stating this. I'm just looking at original cultures, and their effects several thousand years on.
I really can't find a universal god/goddess. That's pretty much an anachronistic modern idea: because the recent monotheistic religions are "universal" in that they've spread, by conquest, it follows people 10,000 years ago, people who never went more than 100 miles in their lives must have somehow possessed universal god/goddesses. I'll gladly change my opinion on this, if any solid evidence can be presented to do so. I'm really not wedded to the idea. Only to the facts.
I also would need to replace Goddess with a very generic precursor religion and not something relatively advanced -- that is why I selected Goddess because it was the basis from which all other religions expanded upon.
The chest-based horse harness evolved in China at least 3000 years ago, but it didn't show up in Europe for another 2000 years or so. And many cultural groups never developed any kind of horse harness, because they didn't have horses. A god/goddess such as might be worshiped in the Nile flood basin would be very different from one discovered and worshiped in the frozen steppes of Siberia. The solar deity of Japan was a goddess. The solar deity of the Doric Greeks was a god. For some groups, solar deities were beneficent, but for others, who lived in deserts, they were malign figures who had to propitiated, rather than worshiped.
Yeah, I'm going on a bit, but I'm just trying to emphasize that there wasn't any monotheism, masculine or feminine, back 10,000 years ago. Even Jung postulated that deific archetypes were specific to certain ideas, so that while you could find numerous trickster gods, grain goddesses, travel deities, etc, you wouldn't find everybody worshiping A God, or A Goddess, spontaneously. Conditions differ per culture, and what people perceive as good or bad, their wants, their goals, their fears, color the kinds of deities they discover.
I hope you are not basing allot of your ideologies on Wikepedia since that is not an academic source -- I mean anyone could put anything they want there. It is a good place to start, however. . . .
An academic
source? No, certainly not. If you'll reread what I wrote above, you'll see I was commending the person or persons who did those articles for getting them correct, although the information is relatively basic (while remaining extensive). This implies I've done my research from numerous other sources, and in this case, long before there was a Web .

I wasn't going to recommend any sites or books that might give a newcomer acute intellectual indigestion. Do you want some scholarly info
detailing acute similarities between Dionysian, Judaic, and early Christian religions? A
discussion of Dionysiac prophecy? An
essay on Aset/Isis? These are still pretty basic, but good. I can point you to some in depth books, but I doubt you want to go there just for a few paragraphs in a game.
As for the number of words, the less the better. I am not a proponent of lengthy word counts equaling authentication or substance. If you can do it in 20 words, great. If you can do it in 10 words, even better. You get my idea.
So Isis, Throne of the Stars, might be, "Isis, daughter of the Earth and the Sky, was first written of 5000 years ago. She was seen as the ruler of magic and fertility, secrecy and compassion." That okay? And Dionysus, The Vine of Ecstasy: "First written of 3500 years ago; likely much older. God of wine, sex, insight and intuition."