Neanderthal... Nephilim?

Apparently, we interbred with Neanderthals at some point in the distant past, giving us a gene for a better brain. Two interesting points not mentioned in any article I've seen so far. First, this means (from what I know of biology) that Neanderthals had the scientific name Homo sapiens neanderthalensis not Homo neanderthalensis since it's impossible to reproduce with an individual outside of your own species.

Second, and more interesting, this lends some credence to the old theory that the Neanderthals were the inspiration for the Biblical Nephilim. (Sorry about the link to the religious nutjob site, but it illustrates the theory pretty well.) The Bible (Genesis 6:1) says that some angels (the Grigori or Watchers) interbred with the "daughters of man," giving birth to a race of giants. The Neanderthals were more robust than H. Sapiens, and so would have been their offspring. Also, since this news appears to imply that Neanderthals were more intelligent, it explains why they would be thought of as angels.