Of course, but assuming there actually was a "revelation" of Genesis to Bronze-age primitives, such a process would appear to be magic. And all magic relies on the concept of "dead naming," or the correct words having power over objects, "spoke" would be the only way for them to describe it.
This is, of course, ignoring the fact that an eternal being with no peers would have no need for language.
This is, of course, ignoring the fact that an eternal being with no peers would have no need for language.