Requiring explanation when science has yet to resolve an issue is like evoking Santa [as from the song] whenever stumped.
My life would not be worth living if I had all the answers. It is the wonder, the challenge of discovery that keeps me going.

At this season of the Winter Solstice may reason prevail. There are no gods, no devils, no angels, no heaven or hell.
There is only our natural world.
Religion is but myth and superstition that hardens hearts and enslaves minds.
[from a placard in the Oregon Statehouse 2008]

The word God is for me nothing more than the expression and product of human weakness, the Bible a collection of honorable, but still purely primitive, legends which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this.
-1954 Albert Einstein [letter]

Never would I claim that those with religion are stupid. I do not believe in evolution, nor do believe in the non-existence of god. I am satisfied to date with a preponderance of evidence for evolution, and lack of any evidence for god; both as collected by scientific method. I will proceed as though my positions are sound, under the best scientific evidence.

Further religion [not god] is eminently destructive to peace among peoples of the world; producing a neo-tribal behavior. 'We' subjugate or destroy those not in our 'tribe', those competing for the same resources.

So those who follow religion are not stupid, but contribute dangerously to strife in the modern world.Additionally those following a religion often waste resources that could better serve the needy more directly, e.g. monasteries, missionaries, radio a& TV broadcasting, and much more. Moreover the religious often struggle against evidence, & progress found through science.

So they are not stupid; just intellectually lazy, misguided, wasteful, and if not actively dangerous to world peace are at least enabling those who endanger us.

All newly found fossil species are missing links.
All species are transitional forms.