That is from the Talmud and describes the 70 languages used after Noah's story (although that was based on the older Gilgamesh story of a worldwide flood that only Gilgamesh survived by building a great ship for him and his family) and refers to God scattering people into 70 languages at the tower of Babel (another borrowed story used to explain why people of the various nations all spoke a different language). Read the verses you quote more carefully if you intend to use them to make your point. Because those verses certainly don't. And 46 and 47 say nothing about your claim- they are instructions on what to teach children.

I'm not saying your story is incorrect but that you should be more careful using Bible verses or you might lose readers who want to agree with you, and those who don't.