The problem with creationists is they've been made to believe evolution is either something really complicated and hard to understand, or else it's something really stupid that no sane person could believe, like monkeys having human babies or crocodiles changing into ducks.
In fact it's something so simple that no sane person could not believe it. There are only three things needed for evolution to happen.
- Inheritance of physical characteristics.
- Imperfect reproduction of those characteristics to give variation.
- An environment which favours some variations over others making it more likely they will be passed on to the next generation.
Does anyone seriously doubt any of these? If so which?
Inheritance of physical characteristics? Haven't you noticed how children usually look quite a lot like their parents? Haven't you noticed how fish tend to have fish offspring and birds tend to have offspring which look a lot like themselves?
Imperfect reproduction of those characteristics? Haven't you ever noticed how you can tell the difference between individuals of many species? How some individuals have different colours to others or different markings? How some individuals are bigger or smaller or faster or fatter or thinner?
An environment which favours some variations over others? Do you think an animal which gets eaten is going to have more offspring on average than one which doesn't? Do you think an animal which finds food more easily is going to produce fewer offspring than one which can't get enough to eat? Or do you think this won't make any difference? How about an individual who finds a mate more easily than another or who rears its young more successfully? Which do you think is going to produce the most descendants on average?
So, if you believe evolution doesn't happen, you have to tell me what is impossible in any of these steps. Simply repeating a dogma in the face of the logic won't work. You have to say why.
If you can't tell me that, you have to tell me why these three simple steps don't lead to more of the physical characteristics which were favoured by the environment being present in the next generation, and so the ratio of those different characteristics changing over time in such a way as to make the individuals carrying them better at surviving and producing offspring in that particular environment?
Because, if you can't, you don't disagree with evolution even though you wish you did and even though you might have a book which says it doesn't happen. In fact, if you can't tell me why this is wrong you're agreeing that evolution not only happens but that evolution must happen if those three simple steps are present.
In other words, if you accept these three simple step occur, then you believe in evolution just as completely as does any evolutionist.
So, anyone willing to tell me why evolution can't happen - and so prove they don't believe in evolution?