Was there any believer in the one true God left after the Tower of Babel?

According to the teaching, about 200 years after the Tower of Babel, there was not a single believer in the one true God left. The forefathers of Israel, including Terah, served other gods and were idolaters. A possible exception, Seth, was mentioned but set aside.

Les explains that Joshua 24:2 records God's word through Joshua, stating that the forefathers of Israel, including Terah, Abraham's father, and Nahor, dwelt beyond the river and served other gods. He notes this was about 200 years after the Tower of Babel, and he had previously stated that at that time there was not a single believer in the one true God left. When someone asked about Seth, who was evidently still living, Les responds, 'Well, we'll let Seth go by.'

After the Tower of Babel, was there anyone left who believed in the one true God?

Joshua 24:2 says the forefathers, including Terah, Abraham's father, served other gods and were idolaters. About 200 years after the Tower of Babel, there was not a single believer in the one true God left; the caller's mention of Seth was set aside.