Question: How do you argue the point of scientific truth (not belief, or ideology but truth, demonstrable through what we know about physics, chemistry and/or mathematics) with a non-scientist?
Answer: You can't.
Back to ignore. It's much less aggravating.
EDIT: That graph to which you allude has a time-axis of hundreds of millions of years. We are looking on the order of a few hundred thousand years, or about the last millimeter of the time-axis.
See above point on arguing with a non-scientist.