[Blood of Tyrants]

Looks like those rock churches were carved because of the influence of Christianity, not from the mythological African empire. And the literature was mostly translated and copied from other languages.

So what influences did this have on the rest of the world? What did they contribute to humanity or science?

[Harmless Teddy Bear]

Of course they were carved because of the influence of Christianity. Ethiopia was one of the first countries to embrace Christianity. Prior to that they were a mix of pagan and, oddly enough, a form of Judaism. You might remember "Operation Moses" during the 1980. If not, look it up. Fastening story.

However part of the reason they embraced Christianity so readily was that they were already civilized.

Look up Axum.

And as to the " literature was mostly translated" when it came to the Bible that was so. But they also produced a great deal of original work. And they had developed their own written language prior to that point.

They were one of the great nations/empires of the time. Sadly, as did the Persians they met up with the Mohammedans and a great deal was destroyed by the savages as they fought for their lives.

Unlike the Persians they did not succumb and Ethiopia remains majority Christian to this day.