I think failure to separate the concepts of "fact" and "theory" are step one in allowing anti-science to sow confusion.
Evolution is a FACT. Then there is THEORY about how it comes about. Details of the theory are what scientists still discuss, not the fact (and not the core of the theory). Weaknesses in the details of the theory *should* be up for discussion, or you're not teaching science.
That things fall is a fact. The theory of gravitation is still an active area.
That the earth is a ball, rather than flat, is a fact. Theory about how planets form is still an active area. Etc...