A frustrating thing that biblical creationists have to deal with is when Darwinists insist that we're wrong, but don't have a handle on their own belief systems. It's not unusual to have some owlhoot say, "Well, since you believe in a little evolution, since a little leads to a lot, therefore you believe in particles-to-parking attendant evolution", followed by insults. (Here's a bit of helpful advice: don't tell us what we believe when you don't understand what's going on, pilgrim.) Papa Darwin taught that slow and gradual natural selection caused evolution. That has been largely abandoned in favor of neo-Darwinism, (although the term is often shortened to "Darwinism") because of a better understanding of genetics.
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Darwin’s theory that species originate via the natural selection of natural variation is correct in principle but wrong in numerous aspects of application. Speciation is not the result of an unlimited naturalistic process but of an intelligently designed system of built-in variation that is limited in scope to switching ON and OFF permutations and combinations of the built-in components. Kirschner and Gerhart’s facilitated variation theory provides enormous potential for rearrangement of the built-in regulatory components but it cannot switch ON components that do not exist. When applied to the grass family, facilitated variation theory can account for the diversification of the whole family from a common ancestor—as baraminologists had previously proposed—but this cannot be extended to include all the flowering plants. Vast amounts of rapid differentiation and dispersal must have occurred in the post-Flood era, and facilitated variation theory can explain this. In contrast, because of genome depletion by selection and degradation by mutation, the potential for diversification that we see in species around us today is trivial.To read the rest, click on "Molecular limits to natural variation".