Hi Mary,
 
Have you ever heard of Jonathan Kleck? He has a show on Blog Talk Radio in the evenings from 9-11 pm Eastern. He is of the mind that our DNA has been alterred and we are half sheep and half goat. It would seem to explain alot of things like why we have this internal war in or minds constantly about right and wrong. It is persistant.
 
His address is http://www.JohnathanKleck.com
 
He has done some outstanding research on decoding some ancient hyroglyphs of Akhenaten and Nefertiti. There is NO DOUBT that our DNA has been manipulated in the past and according to Jesus words that the end times would be as they were in the days of Noah, it would mean that our DNA is going to be tamperred with again in the end times.  This has been the center of debate for several years in the escatological circles. I am convinced that the mark of the beast that is going to appear SOON will have some way of transforming our DNA in a bad way if one takes the mark, which at this time looks to be a RFID Chip that will be inserted in the right hand or fore head.
 
As far as weather or not some BAD Nefilim DNA made it in to mainstram society back when Israel was to enter and take the promised land from the giants, I seem to remember that they did NOT kill off all of the Nefilim as instructed by God Almighty at the time. I could be wrong about this but to my memory, I can't remember them finishing the job. That would mean that our DNA would be contaminated to this day and Johnathan Kleck would be correct, which I feel he is truly inspired by our Lord and has been called out for a purpose unto the Lord for these times. Check him out, you won't be disappointed! 
 
YBIC
 
Michael P