Since Darwinism is clearly in shambles, what is an alternative theory which better accomodates the evidence?
Since Darwinism is clearly in shambles
In the 19th-century context in which Darwin's Origin of Species was first received, "Darwinism" came to stand for an entire range of evolutionary (and often revolutionary) philosophies about both biology and society.
Since Darwinism is clearly in shambles, what is an alternative theory which better accomodates the evidence?
God did it.
You might want to prove that first.
... as there is no real indication that tree shrews morphed into humans, or chimpmunks into horses
Rather than "panspermia" supposedly being a possiblility of how simple life forms got to Earth, and as there is no real indication that tree shrews morphed into humans, or chimpmunks into horses, why not just note that animals cannot cross syngameon boundries to reproduce, and then concentrate on establishing the limits of the syngameons vis-a-vis extant and extinct creatures, saying that the origin of the syngameons is subject to debate?
Then just leave the Darwinism for the philosophy and religion departments.
Darwinian faith is science, as proponed by mainstream academics, when actually it is just another philosophy or religion, afterall, it does take faith to believe that frogs morphed into birds, and mold morphed into spiders.
Why do you insist on making up an entirely new science (or at least an entirely new viewpoint in science) to argue against, instead of arguing against the real thing? Or is it that you have nothing to argue against within the accepted theories of evolution?
"Environmental motivation" means natural selection.