In very basic terms, evil.
Satan will someday mislead humans into believing "the lie".
I believe that "lie" will be the same as was in the Garden of Eden. That we, humans, can be like God. It is a very tempting proposition.
We were created to be creative. I have no problem with man demonstrating this capacity. I only have a problem with man thinking and believing that he CAN be like God.
That way lies the danger.
We [humans], can already fly, cure diseases and do many things that ancient people would consider "godlike".
At what point do we cross the threshold from being human to being "like God"?
I will also add this from my post #67:
First, I must say that humans or sentient robots will never be God. God is infinite perfection. The most we can do is advance ourselves to previously unimaginable heights. We can never be infinitely perfect.