This is clearly false. If we go back through history, there have been thousands of deities proposed and backed by anywhere from hundreds to millions of theologians. While I don’t know what Yahweh’s share is through history, I think it’s safe to say that it is not even the majority. I don’t think any particular deity nor pantheon has achieved that status. If we add the Abrahamic religions together, I’d be willing to go as high as 25% (at a guess), but nowhere near 95%.
We also should check how much theologians actually seem to know about their subject and how or whether that knowledge has improved with time.
If we look at the hundreds or thousands of religions that exist, they all have entirely incompatible creation stories. Thousands of different groups of humans have been ordained the descendants, the special ones, etc. of a particular pantheon of deities.
If we take one example, the Jews were ordained the special, protected ones by the god, Yahweh. He promised to lead them to victory in all battles and see to it that they lived amazing lives, so long as the male Jews all underwent circumcision and followed God’s laws, like the requirement to take a disobedient son in for execution by stoning (a law which Jesus expressly reasserts in the Gospel of Matthew - the earliest and least adulterated of the Gospels).
But the Jewish kingdom was quickly overtaken by the Roman empire and then destroyed. The followers of Jesus, who were neither Jews nor circumcised, ended up becoming the favored of Yahweh, despite the clearly written and authoritative works that had been compiled by theologians centuries before and rigorously disseminated. The Jews ended up being persecuted and reviled for the next 1900+ years.
Now, the Christian explanation for this is that the Jews failed to accept the word of Jesus. Within the Jewish religion, Jesus was far and away from being a learned theologian, let alone being among the majority on the realities of Yahweh.
But one thing that Jesus taught was that it was more important to Yahweh that people lived decently, than that they believed in him. He preferred a non-believer who was good over a Jew who was evil.
So how does that explain that time when God destroyed 95% of the native peoples of the Americas? What did they do to deserve that? Most of them were killed in-land, before the white people ever even got to them and had a chance to try and spread the word of Yahweh.
Did the theologians learn from this? Did they go back in and update the Bible to clarify whatever it was that would have explained God’s wrath in this instance?
Perhaps yes. Just as Christianity was created when the Old Testament proved itself wrong, Mormonism seems to have been created when the New Testament proved itself wrong as well. Are you Mormon?
The Shinto religion makes it clear that the Japanese are the divine and special people, the literal children of the gods. Earth was made for the Japanese islands, and then everything else was just an afterthought.
It was a big shock to the Japanese people when they discovered how small their island was compared to the rest of the world.
They haven’t updated the religion to explain this discrepancy.
The Romans worshiped their gods and followed all of the best advice on how to appease them, so that their country would prosper, harvests would be bountiful, etc.
Where are the Romans now? If the gods bring great harvests, why was Norman Borlaug necessary, to prevent famine from overtaking India?
The Aztecs straight-up sacrificed fully grown humans and warriors to their gods, at the insistence of the learned theologians. Disease took them out and then they were conquered by evil men who wanted nothing except to rape, plunder, and enslave.
Science told us that we should stop praying for the sick and instead to wash our hands. Proper sanitation never appears once in the Bible as any form of recommendation by Yahweh, and yet we can spot the instant it became the norm by plotting the average life expectancy over history.