A few materialist scientists themselves sowed doubt in the wind blown field of Darwinist faith claims. Among them: directed panspermia (e.g. Francis Crick), punctuated equilibrium (e.g. Stephen Jay Gould), and the anthropic principle (e.g. Frank Tipler). All of these claims have been put forward because materialist Darwinism utterly failed to account for the origins of life on earth in the few billion years available for the task and the fossil record lacks evidence of even the tiniest complement of transitory life forms that Darwin himself said his theory required.
Darwinism has devolved into a set of unintentionally funny often contradictory surmisings of why certain life forms have certain features, rank speculation fobbed off as serious science. It is no more scientific than astrology.
It cannot stand on its own in the marketplace of ideas which is why its faithful are so quick to invoke the power of the state to keep honest critics silent.