If you have not read or seen any news on Transhumanism then you might want to do a little research. It's not just someone gets a bionic arm to replace one that they have lost but they want to make every bit of them digital. They also believe that to truly evolve they have to break away from their mortal bodies.
Sons of GOD in Genesis 6 in Hebrew is called Elohim. When the Sons of GOD saw the daughters of men they thought they were beautiful. The offspring of these Sons of GOD and daughters of men were giants. The genetic makeup of these offspring was carried down into the rest of the human race. That is why Goliath was a giant, because he was a decedent of Sons of GOD.