I once did a persuasive speech for a speech class I was taking on the Nephilim and how Demons had had sex with human women to give birth to Giants. Its a funny thing to argue with people and tends to blow most Christians minds especially when you start quoting scripture.
The best argument Ive heard against it is the Bible verse that says people will be like the Angels and will not take husbands or wives once in heaven. Which most people take to mean that there will be no Male or Female but it could just mean exactly what it says which doesn't actually state that there will be no male or female and simply says they will not have husbands or wives. Which means that the Fallen angels could indeed have been Male. And they tend to argue that Son's of God simply means Men. But yet that doesn't explain at all why their offspring would have been giants...
Anyways if your ever bored its a fun conversation to strike up
