That reminds me of another big point to keep in mind when talking about it to Christiains: that you could dispute their theology rather than their science, and might make more progress by doing so; someone who won't let go of a religious idea over a conflict with science might still let go of that same religious idea if convinced that it was a religious mistake and a different religious belief was more pure and God-intended. But that requires a lot of familiarity with theological debates & disputes.