Unlike religion, science doesn't need apologetics. But it does need those who appreciate the work of science to dispel myths, misconceptions, and pseudoscience, which incidentally often comes from religion (e.g., creationism).
Because that is fallacious. You don't know that they aren't being a "true Christian." They certainly think that they are. By contrast, we have ways of showing that a scientist's work is of poor quality, and we have processes for evaluating their scholarship. Your evaluative processes are tied to your theology, which is not universal even among your fellow Christians.