For all their disagreements, evolutionists strongly agree that evolution is a fact, just as gravity is a fact. There is no question that evolution occurred. And since evolution is as certain as gravity, those who do not assent must not be rational, or they must have ulterior motives. If there are scientific questions about evolution (and there are), they merely relate to the question of how evolution occurred, not whether evolution occurred. Those who point out that the scientific evidence does not bode well for evolution must understand that such evidence can in no way call the fact of evolution into doubt. The scientific evidence can only bear on questions of how evolution occurred.
Now this logic might be reasonable if the scientific problems with evolution were minor compared to the supporting evidence. We certainly do not doubt the fact of gravity even though we do not understand the details of how it works. But then again, the evidence for gravity is rather strong. In the case of evolution, it is the other way around. In the case of evolution, it is the problems which are rather strong.
We don't understand how life could have first evolved, we don't understand how multicellular organisms could have evolved from unicellular organisms, we don't understand how identical unconstrained DNA sequences could be conserved in distant species, we don't understand how shocking differences could have evolved in otherwise similar species, we don't understand how consciousness could have evolved, we don't understand how adaptive mechanisms could have evolved, we don't understand how a thousand and one complex structures, superior to our best military machines, could have evolved, we don't understand how ..., well you get the idea.
In light of the scientific evidence, the fact that evolutionists shout down any dissent makes them look more like the Wizard of Oz than sober scientists. Consider, for instance, the problem of how multicellular organisms could have evolved from unicellular organisms. Bob Holmes reported on this last year in The NewScientist. One problem is that such an evolutionary move must have occurred quickly, without leaving any evidence. As one evolution admitted, "The different branches of the animal tree evolved very rapidly in a short period, a long time ago."
Another problem is that reconstructions of the evolutionary tree are not stable. Was the ancestor of multicellular organisms a choanoflagellate? Or was it a placozoan, or a ctenophore, or even a sponge larva? Different methods lead to different reconstructions. And of course the move to multicellular organisms required more complex designs. Not surprisingly, the details of early animal evolution are still hotly debated.
While evolutionists can provide plenty of guesses about how multicellular organisms could have evolved from unicellular organisms, the fact is evolutionists have no idea how they actually evolved. And if evolutionists have no idea how they evolved, can we really be sure that they did evolve? Evolutionists scoff at such skepticism. It is unwarranted, they say, because evolution is a fact. It seems that rather than the scientific evidence putting to rest problems with the fact of evolution, it is the fact of evolution that is putting to rest problems with the scientific evidence.