Indo-European can have been a construct God used as never humanly spoken original to mould several of the languages (unless he let demons do that giving them such power over men as punishment for assisting at the building project). It can be a series of traits that came together in language after language as they borrowed from each other. Or it can have been - less likely if you ask me - a language which diversified very much as it spread from people to people.
It was not by any stretch the original language of every Japhetic nation after the Tower of Babel.
Just as Semitic languages were also spoken by descendants of Ham (like Asshur or Canaan). Just as Hamitic languages were thus not spoken by all descendants of Ham, but by Mizraim and by the ancestor of the Berbers. Philistines probably spoke Mycenean Greek (Dagon = Potei Daon = Poseidon). And I just mentioned the loads of Hamite peoples who spoke "Semitic" languages. Add Ethiopian speakers of Geez to them.
Why this is important to note is because I was just reading about Semitic peoples in a book that Hovind recommended. Here is the source and the two quotes:
After the Flood
by Bill Cooper
5. Lud: The early descendants of Lud, the Ludim, were known to both the Assyrians and Babylonians as the Ludu. Josephus tells us that their land was later known as Lydia (a direct Greek derivation of the name Lud) which lay in western Asia Minor. (Josephus rendered the name Laud.) The Lydians were famed in the old world for the skill of their archers. They spoke an Indo-European (Japhetic) language, examples of which are to be found on certain Egyptian monuments. The land of Lydia was finally conquered by Cyrus, king of Persia, in the year 546 BC (see Map 4.) (Refs: 1DB 3:178-9. NBD 755.JA l.vi.3. P1:28)
9. Gether: His descendants (known to Josephus as Gather) settled to the south of Damascus. Josephus identifies them as the latter-day Bactrians, famous amongst other 101 things for a breed of camel. Whether this identification is correct or not cannot now be determined. It should, however, be noted that Bactria was populated by Aryan, or Japhetic, tribes in late Assyrian times, whereas the children of Gether were, of course, Semites (see Map 4.) (Refs: 1DB 2:387.JA 1.vi.3. P 1:28)
So, Bactrians speaking "Aryan" cannot be "Semites" like Gether? Well, Lydians are also descendants of Sem, and look at them:
Wikipedia : Lydia : 3. Language
The Lydian language was an Indo-European language in the Anatolian language family, related to Luwian and Hittite. It used many prefixes and grammatical particles. Lydian finally became extinct during the 1st century BC.
OK, Lydians are still descendants of Lud even if they speak Anatolian Indo-European, but Bactrians are maybe not descendants of Gether if they speak Aryan Indo-European? What if Indo-Europeans were never same thing as Japhetites in the first place? What if part of the Indo-European peoples (such as Bactrians, a k a Afghans of some kind, and such as Lydians) descend from Sem?
As we talk about Lydians, it may seem the Phrygians and thus the Trojans and part of origin of the Romans descend from Lydians, and therefore from Lud.
Will be returning to the reading of Bill Cooper now, he is not bad just because he has naive conceptions on 19th C. linguistics.* Or rather outdated conceptions from 19th C.
Georges Pompidou Library
of Paris, Beaubourg
Sunday in Octave of All Hallows
*The site on which I found his book online is Zionist though. Here are the Catholic Haydock comments to the four chapters of Ezechiel they comment on: Ezechiel 36, Ezechiel 37, Ezechiel 38, Ezechiel 39.