According to prof. John Huddleston there is no historical evidence of Abraham from The Genesis. Here is the video. He spokes about it in the first 2-3 minutes: http://youtu.be/21NoQuKTB8Q
Is that true?
Yes, it is true. I watched the first 3 minutes (I don't particularly recommend others do so) and can confirm that the person self-identifying as John Huddleston said there is no historical evidence of Abraham from the biblical book of Genesis.
Absolutely false. There is lots of historical evidence, from Genesis, of Abraham, as even a cursory read of Genesis will reveal.