Nobody truly knows what it is like to create something from nothing, nor does anyone have direct, personal knowledge of a being like God—especially one described in theology as having no parts or physical form. When people try to describe such a being or explain creation in those terms, they are inevitably filling in gaps with their own ideas, assumptions, and cultural influences. From that perspective, creationism can be seen as a threat to the scientific method, because it introduces explanations that are not testable, falsifiable, or grounded in empirical observation. Creation does that anyway - it does it in another way when too much psychology is masquerading as science, when ideology is used to blur the microscope lens.
The scientific method depends on hypotheses that can be examined, challenged, and revised through evidence; when an explanation appeals to an unknowable or supernatural cause, it can halt that process by placing certain claims beyond investigation.
The very suggestion of God and creation give rise to interference by one's faith bias.
It can reduce scientific literacy if students are taught that multiple explanations with very different evidentiary standards are equally scientific. Creationism frequently rejects large bodies of converging evidence from fields like Geology, Paleontology, and Genetics. It may encourage the idea that scientific consensus is mainly political or ideological rather than built from cumulative evidence and testing