I think most people who speak against evolution actually know very little about it, and what they do know comes from creationists who speak with authority but also do not know about it.Every person has about 100 "mutations" added to them when they are born, DNA is never replicated with 100% accuracy. These might not be any change, or they may change the way a protein is folded, or may cause a protein to not be made, and this may benefit the person, it may be a negative for the person, or more likely given the size or our genome, do nothing. Now this isn't just people, this is all organisms, obviously organisms with larger genomes (more base pairs in the DNA) are more subsceptible to this.Now to consider evolution, you need to understand that evolution occurs mainly in small population sizes, unlike humans. If one of these traits enables the organism to reproduce more successfully than another, then that trait is passed down in a greater frequency, and the next generation will have more organisms with that trait. Lets say some of these organisms leave the group, maybe there was a storm and they got split up, it's irrelevant. The ones that left ended up in a different environment, an environment that produces different frequencies of traits, since the trait that enabled the one organism to reproduce more was most likely environmental based (as in, the trait benefitting the organisms ability to reproduce in a particular environment).So this carries on, mutations are automatically introduced, and in small populations these traits quickly move through the population (obviously the quicker the new generations come around the quicker this happens) and incorporating isolation of groups, this leads to evolution.Sometimes, after a long time, the mutations can be enough so that if the 2 groups that split apart are re-introduced, they are actually unable to produce offspring, or maybe they can but the offspring is infertile (like the mule, which is a product of a donkey and a horse)Why is this so hard to understand? How do people say this doesn't happen? We observe the mutations in the lab. That's why when you put antibiotics on some bacteria, well, not all the bacteria have the exact same DNA, due to mutations, and so some actually have some form of defense, or the antibiotic is "less lethal" to them, maybe it takes longer to kill them. And when the antibiotic has killed all the others, the only ones left are the ones that can survive better, so ALL the offspring from the group now has that ability.There is this misconception about speciation as well, as if species are distinctly different from each other. Yes we all know dogs are different from cats, but to class animals into species is a human tool to make biology easier. Why is it so hard to think that maybe some ancestor to dogs, well, there was a group, some of the group ended up on one side of a river and the others didn't, and through the processes I described, one group changed slowly over time, and ended up as foxes, and the other group stayed as dogs? (I don't know my canine biology too well, but it's the same process for all organisms) Why is that impossible to believe?I sometimes think that the only thing that stands in the way of people believing this isn't that they can't, it's because it contradicts what they believe the bible says so it MUST be wrong, despite all the proof. And the more proof the biologists role out in favour of evolution, the more crazy compromises creationists/IDrs need to come up with to explain it away.Science searches for the TRUTH through PROOF. It's not out to disprove God, just use PROOF of things to discover the TRUTH, whatever that may be.Oh, and people who bang on about how evolution is a THEORY need to actually find out what that means, not just what they THINK it means. GRAVITY is a THEORY too, but every single one of us knows that it exists 100% and is undoubtable.