The idea that the earth is flat is so readily disprovable, by so many avenues of approach, as to be ludicrous. So far as "Intelligent Design", I hold a more open mind on that. Darwin's observation that evolution can, through random mutations, produce an organism more fit to survive those conditions that produced it, should be understandable and obvious to anyone. We have examples of it happening all around us. The Salt and Pepper Moth is the classic case, but one reads constantly in the news these days about bacteria developing resistance to antibiotics. That's Darwinian selection at work, and on a humanly observable time scale, since bacteria reproduce so fast.
Can Darwinian selection account for all the results of evolution, though? I don't think that it can. Were Darwinian selection all that shaped us, then we should be eminently suited to survive, but that's ALL that we should be. Factors that did not affect one's likelihood of survival might arise, and breed true among a certain percentage of the population, just as, for instance, some people find aspirin intolerably bitter, and some cannot taste it. The mutation seems to have no effect on survival, so as one might expect from Darwin, it's just out there, neither favoured nor disfavoured. Some people have it, and some don't.
There are, however, some strong traits of humans that don't seem to really be tied to any kind of Darwinian evolutionary pressure. Music, for instance. Humans pretty much universally have an appreciation for music, to the extent that people who can't enjoy music are pitied as a type of cripple. That seems to be a constant in every human culture, however much they may differ otherwise. If there are cultures to whom music is incomprehensible, I have not heard of them. Moreover, some studies seem to show an awareness of, and appreciation for, music among other species. I have a very hard time believing that Darwinian natural selection can account for that.
Actually...appreciation of music CAN be argued is a form (or result of) of natural selection...those from early species who couldn't understand the beating of a tree or drum was a warning sign that a tiger was about to come into the village were eaten by the tiger (that is a very VERY basic example... would take a term paper to go into great detail and that isn't what this is about), also sounds (or music if you will) was and is a way for some species to attract.. and those that don't understand it tend to die off...so in short.. sound or music is not only something for pleasure, but was (and to some extent still is) a form or communication...totally in line with natural selection
"The truth is what is, and what should be is a fantasy. A terrible, terrible lie that someone gave to the people long ago."- Lenny Bruce