The most absurd thing is that the Watchtower Society still shows in its literature (their Insight Encyclopedia), that Adam was created 6000 years ago:
Finally, after 930 years, most of which was spent in the slow process of dying, Adam returned to the ground from which he was taken, in the year 3096 B.C.E., just as Jehovah had said.—Ge 4:8-26; 5:5-24; Jude 14; see LAMECH No. 2. (Insight, Volume 1, Adam)
This is, of course, unacceptable in this XXI century. Neanderthals disappeared 40 000 years ago, and the overlapping with modern humans is just about 5000 years. so there were modern humans more than three decades before the mythical Adam.