
One of the major difficulties creationists seem to suffer from, at least in the way they deny evidence and logical argument, is a seeming inability to do basic joined up thinking. I appreciate that many creationist merely feign this inability in the same way they feign ignorance and even difficulty with basic comprehension when presented with unarguable facts.
For example, lead a creationist carefully through the three steps needed for evolution to be inevitable and you can get them to agree every single stage - inheritance of traits, imperfect replication of those traits giving variation and an environment which ensure more of some variations and less of others get to reproduce - and they will feign an inability to join those dots to see that this gives more of some variations in the next generation and fewer of others. And even if they admit that last conclusion, they'll still declare evolution to be impossible and declare it doesn't happen.