Evolutionists have to rely on logical fallacies, because there is no evidence supporting the theory that species produce offspring that are not of their species. Only by using logic errors can evolutionists generate a belief in something that has not occurred and is not occurring.
Begging the Question: This is circular logic. An assumption is used to validate a premise. Evolution is assumed to be factual; therefore, evolutionists dismiss outright fraud as being acceptable because it illustrates a true point. One popular form of this is, "Although it is mathematically impossible for life to have occurred by chance, we're here, so that proves it happened."
Hasty Generalization: A small sampling of data is used to “prove” a large conclusion. For example, evolutionists like to claim that evidence of people dwelling in caves in former times means humans came from a more primitive species. This is overgeneralizing at its extreme. In fact, humans are still dwelling in caves, and not because they are a primitive species.
Hypothesis Contrary to Fact: This tries to prove a point by creating a hypothesis that has already been disproved. For example, evolutionists state that theists are retarding science. This is contrary to fact. Many scientific advances were made and are being made by people who believe in God. Copernicus, Kepler, Galileo, Newton, and Mendel, for example, all believed in God.
Misuse of Authority: A group of “experts” is used to prove a conclusion, even if that group does not actually agree with it. An example is "All educated people know evolution is a fact."
Chronological Snobbery: This fallacy says that the evidence is ancient, so it can't be verified by observation. Thus we have the "millions" of years timetable for evolutionists.
You will find that every argument in favor of evolution hinges on a logical fallacy. All the evidence clearly points to design, not accident, as the source of life.
They have none. It's a religion.