Final answer:
The weaknesses of evolutionism primarily stem from historical scientific gaps, such as understanding heritability, and philosophical or religious objections, not from the current scientific stance which overwhelmingly supports evolution. The theory of evolution has been robustly backed by empirical evidence and scientific consensus.
Step-by-step explanation:
When discussing the weaknesses of evolutionism, it's important to distinguish between criticisms from a scientific perspective and those from a religious or philosophical standpoint. From a scientific view, one historical weakness was the initial lack of understanding of the mechanism of heritability, which has since been illuminated by the discovery of DNA and genetics. However, virtually all working biologists today accept the theory of evolution due to its extraordinary explanatory power and the vast amount of evidence supporting it.
Religious and philosophical objections to evolution often include arguments such as the incompatibility of a naturalistic process with the belief in a deity's active role in creation, or the apparent conflict between scientific explanations and certain religious texts. Another philosophical challenge posits science's inability to comment on the existence of a spiritual realm, which lies outside the purview of empirical investigation.
Assertions that evolution is controversial among scientists are factually incorrect. Scientific consensus strongly supports evolution, as demonstrated by numerous statements from scientific organizations and the absence of peer-reviewed scientific papers refuting the theory. Potential conflicts with religious beliefs do not constitute scientific weaknesses and should be recognized as separate from scientific discourse.