Like so much else connected to invented religious belief, creationism comes in a variety of guises in which invented beliefs range from the sublimely ridiculous (flat earthers, geocentrists, and YEC), through the pretentious (intelligent [sick] design theory). The variety of religious and creationist beliefs is directly attributable to the contrived, invented nature of all religious beliefs, none of which comprises an internally consistent logical system based on evidence.
Typically, creationists are theists who cling to religious views with varying levels of dogmatism whilst ignorantly choosing to deny or distort most or part of scientific knowledge. Such ignorance is religiously motivated, substituting varying levels of Biblical literalism and insistence on Special Creation for scientific fact.
At the most realistic, scientific end of this spectrum comes philosophical materialism. The following list is from TalkOrigins:
Young Earth Creationists
Old Earth Creationists
...(Intelligent Design Creationism)
Methodological Materialistic Evolutionists
Philosophical Materialistic Evolutionists
Evolutionary science is complex because it includes information from so many areas of science. However, the fact of biological evolution is acknowledged by the majority of scientists and denied only by religiously-biased individuals, most of who are not qualified in the relevant areas.
Cartoon The Evolution of Creationism