I found this and thought it would fit into this forum.
What is creationism? Creationism is the idea that all forms of life, and particularly humans, were independently created by a willful act on the part of a deity or superpowerful entity.
What's wrong with creationism? That depends on what form of creationism you're talking about. There are several forms of creationism, all different. None are really scientific, though not all are unscientific to the same degree.
Old Earth creationism holds that Earth was created a very long time ago, and populated with life more or less as shown in the fossil record. However, new species of organisms were created one by one over all that time, each the result of a separate creative act by the Deity. This position is a perfectly viable way to reconcile the Bible with the rock record. But it's not scientific, because it can't be falsified. Any evidence can be made to fit into it.
Sequential creationism says that Earth is old, and the major groups of fossils do reflect organisms living at different times in Earth's history. However, the major mass extinctions represent times when all living things were destroyed, and then the Earth was repopulated by a new creative act. The last extinction happened recently, after which the current animals -- and humans -- were created. Again, this is a viable way to reconcile science and the Bible -- but it isn't scientific either. Sequential creationism simply doesn't agree with the evidence. None of the mass extinctions wiped out all life. In many cases, we find the same species of organisms both before and after the extinctions.
Day-age creationism says that the Book of Genesis is accurate in describing the order of Creation, but that each "day" in Genesis actually represents a long period of real time. This position also runs afoul of the evidence, primarily because the order of creation as given in Genesis doesn't agree with the order as shown in the fossil record.
A very widely-held view is the one called theistic evolution. This position boils down to "God Created, and evolution is the way He did it." The theistic evolutionist says that evolution has occurred as shown in the fossil record and in modern organisms, but that God has guided the evolutionary process to make it come out the way He wanted. In particular, humans evolved from ancestral apes, but at a particular point in time God picked two or a few humans and gave them minds and souls, thus making them more than animals. Theistic evolution is the most science-friendly version of creationism, so much so that I often don't consider it creationism at all. Theistic evolutionists accept all the scientific evidence for evolution; they just put a somewhat different interpretation on it.
Old-Earth, day-age, gap theory, theistic evolution -- all these are simply different interpretations of the known geologic and fossil evidence -- difficult to defend, perhaps, but no more so than many other hypotheses. The remaining forms of creationism are much less pleasant: Young-Earth creationism and Intelligent Design creationism. While these two movements call themselves by different names and claim to have different agendas, behind the scenes they are connected, sharing common goals and a truly disgusting disregard for scientific fact and honest, open discussions.
Young-Earth Creationism (YEC) is the position that most of the politically active "creationists" hold. Young-Earth Creationists demand a literal reading of Genesis. They insist that Earth is less than ten thousand years old; that it and all life were created in just six twenty-four-hour days; and that the entire fossil record is a result of Noah's Flood. They claim to have "scientific evidence" for this, but in fact their "evidence" consists partly of mistakes, partly of misinterpretations, partly of old stories now known to be wrong, and partly of outright lies. YECs routinely lie about the scientific evidence, both that for evolution and that against YECism, and don't even see anything wrong with their blatant dishonesty.
