It's pretty simple really. You show them something using science, but they notice that it appears to contradict the Bible in some way. Thus they totally reject what you show them, carry on putting out their own half-baked hypotheses and half-baked refutations, and generally carry on insisting "the Bible SAYS...".
Thus:http://creation.com/refuting-campbell-y ... eformation
Thus the 'Question Evolution Project' on their Facebook page currently:
"Shared from Ken Ham, Dawkins is disingenuous. He won't debate creationist scientists because he uses the old lie that they're not real scientists. NCSE has the same nonsense going". One of their bigoted supporters has then commented underneath: "Suppressing the truth in unrighteousness. And exchanging the truth for a lie. Same old same old. I pray that while they are (in a sense) learning, that they'll come to a knoweldge of the truth. (I'm sure they know, but their self professed wisdom distorts their perception, becoming fools)".
Or Dawkins interviewing Wendy Wright:http://www.youtube.com/watch?v=YFjoEgYO ... E0B4B74477
In part of the transcript as given in chapter 7 of 'The Greatest Show on Earth' she refused to consider evidence in favour of evolution and kept on subtly trying to change the subject in order to criticise behaviour by so-called evolutionists.
And they wonder why I and others call YECs 'anti-science'. (Or they pretend to wonder in order to paint all their critics as 'intolerant'.)
There is no room for ANY science about the past in their newly acquired dogmatic worldview.
Why? Because, surprise surprise considering when the Bible was written, THE FINDINGS OF SCIENCE DO NOT SUPPORT THE HISTORICAL ACCURACY AND RELIABILITY OF THE OPENING CHAPTERS OF GENESIS. IN CASES WHERE THE CREATIONISTS ARE NOT IN GENUINE IGNORANCE OF THIS REALITY (SOME ARE), THEY HATE THAT REALITY OR ELSE MANAGE TO CONVINCE THEMSELVES THAT THAT IS A 'LIE' OF SATAN AND A 'FALSE REALITY'. AND BECAUSE THEY ARE ALSO AFRAID OF GOD THEY THUS ATTACK PRACTISING SCIENTISTS AND ANY AND ALL IDEAS THAT UNDERMINE GENESIS AS 'REAL' AND 'COMPLETE' HISTORY - PRETENDING THAT 'EVIDENCE' IS ON 'THEIR' SIDE AND THEIR SIDE ONLY.