You are asking a group of people who believe the world is no more than 5,000 years old and there is no evidence (in their eyes a serious intellectual way) that humans evolved from primates for a straight answer why they do not believe? Especially since those that due are liberal which are obviously wrong all the time in their opinion just look at obamacare etc so there is zero credibility.
It is an embarrassment such a solid group even exists in my country! I just can not fathom this in the 21st century people who are afraid of change but they exist and are very gullible. The same political party also supports big business and oil and the other half who votes believe whatever they hear on Fox, Rush, and their church pastor who also gets his information from the same sources who are funded by the energy industry. In other words they perfect combo.
My point of this post is not to go offtopic but to point out it is political. Not scientific. You can't argue with gullable people who think facts are not fact. Only gut feelings.
FYI I am not bashing libertarians who may want to mod me down. I am bashing those in the same wing politically who are social conservatives.