The reason scientists do not take seriously the claims of Intelligent Design theorists today is the same reason that scientists did not take seriously Wallace’s speculations about an “overarching intelligence.”
Wallace emerges from Darwin’s shadow, leaving Darwinian “explanations” looking less like progress and more like — to borrow Wendell Berry’s phrase — “leapfrogging into the dark.”
No religious believer, evolutionary theory’s co-discoverer came to argue in terms remarkably similar to arguments made today by intelligent-design theorists. Or did he?
In Wallace’s science there is no supernatural. There is only the natural and unexplained phenomenon yet to be incorporated into the natural sciences.
Wallace would break from Darwin in 1869 and develop a theory of intelligent evolution that in many ways presaged modern intelligent design theory.