Hi leolaia
You have a greater knowledge of the process of language it's complexity and distinctiveness. But none of this stops God being the creator of language. As far as I can see your refutation of the biblical account is on two simple grounds. The Bible timeframe does not go back in time enough and you simply cannot see a Divine intervention explanation for this.
How do you explain the variety of languages that appeared? why would more than one appear? You show yourself that when two groups meet one group tends to either take on the other's language or blending of the two together.
So if language evolved from one human group why would it diversify to more when the opposite is what happens when people are brought together?
Are you saying humans split up and in every single separate group they all evolved the ability to have language separate from each other, in their own groups?
You are right I have a vested interest in believing the Bible account but since Darwinism offers no explanation just a lot of unprovable theories aka "out of africa theory", "candlabra theory" and yes I do call the bible a basic explanation clearly not scientific enough for you but it does show why we have so many languages. Wherever humans exist language exists. Every stone age tribe ever encountered has a language equal to English, Latin, or Greek in terms of its expressive potential and grammatical complexity. Technologies may be complex or simple, but language is always complex.
In Judeo-Christian tradition, the original language was confused by divine intervention (which I agree with), as described in the story of the Tower of Babel in Genesis. There is a similar story from the Toltecs of pre-Columbian Mexico, who tell of the building of the great pyramid at Cholula, and the dispersal of the builders by an angry god. And similar stories are found in other parts of the world. This for me shows a racial memory of the event.
Bible plus the back up of racial memory for me is more accurate than scholar speculation. I appreciate that you have a differing viewpoint on this.
And if we look at language now aren't we looking at the evolving of the entire world into English speaking one language group? now we are connected by the internet and communication and interaction is becoming closely connected?