You are wasting your time. Evidence is for people who want to be convinced.

If this is actually important, don’t push them to adopt your conception, interrogate theirs. Find the contradictions and insist they explain them away. Keep reminding them of the inconsistencies in their own claims. Force them to confront them instead of moving the goalposts. Record every concession and don’t allow them to backslide.

A motivated believer will hold out for a long time because they risk losing a part of themselves. Is this really how you want to spend your time?