Well, there are several reasons that I could go into at length, but you really don’t need any more of an explanation than this essay by Jason Colavito. What he’s shooting at is a testament to poor thinking, shoddy research (biblical and otherwise), incoherent theology, and lack of ethics in handling sources responsibly. The assumptions brought to the “research” by the Christian nephilimers are easy targets and deeply flawed. Colavito doesn’t need to devote more than a sentence or two to demonstrate that. Sustained critique would turn the critique into a flogging. It’s disturbing that those who promote this material cannot tell the difference between correlation and causation, and can’t see the non sequiturs. As I’ve often said of the work of Zecharia Sitchin, there are only two explanations: incompetence or malice/lack of ethics.
And yes, it’s unethical to use the Bible to prop up the content of Ancient Aliens. In Christian-speak, it’s ungodly.
The Christians involved in this think they are going to win arguments doing this stuff. The exact opposite is the case. They build a theology on workable foundations, setting up (and leaving) the faithful for only two options: (a) conspiratorial explanations of why their work is laughed at, or (b) throwing the Bible aside.
Most Christians in Middle Earth choose the former — which only delays the outcome of the latter.
What a work for God.