Emily Helliwell explains her approach to talking with creationists. In short, focus on the concepts that are important to the here and now:
If we want to get back to the dinosaurs, we can say the cumulative effect of billions of years of changing environments have allowed for some pretty amazing creatures to come and go. But, let’s resist the urge to talk about that, and stay focused on the small-scale stuff. Because if there is any concept necessary for our modern, developed society to believe in and understand, it’s microevolution.
Through microevolutionary principles, we would not have developed two of the most important contributions to society, antibiotics and pesticides. Without antibiotics, we would be subject to horrible infections, and without pesticides, we would be subject to devastating crop failures. Many of us would be dead or suffering.