No, "creationists" are not liars at all!
They are something far, far worse. They are believers. One cannot converse with, speak sensibly to, or have a fact-filled logical arguement with, a believer. The best a person can do with a believer is smile at them sweetly, and ignore their "arguements".
Once a belief is held by a believer (regardless of how groundless, silly, or inane it may be), no amount of facts or truths will change their beliefs. And it is fruitless and a waste of time to attempt to.
:-)
Evos in a nutshell.