From Uncommon Descent:
Atheists/materialists/physicalist/naturalists are delusional. Here are 10 reasons why:
1. They dismiss morality as nothing more than strongly felt subjective preference, but admit they act as if morality is objective in nature.
2. They speak, act and hold others responsible for their behaviors as if we all have some metaphysical capacity to transcend and override the deterministic effects of our body’s physical state and causative processing, yet they deny any such metaphysical capacity (like free will) exists.
3. They deny truth can be determined subjectively while necessarily implying that their arguments and evidences are true and expecting others to subjectively determine that their arguments are true.
4. They deny that what is intelligently designed can be reliably identified when virtually every moment of their waking existence requires precisely that capacity.
5. They deny that some abstract concepts are necessarily true and objectively binding on our existence (such as the fundamental principles of math, logic and morality) yet reference them (directly or indirectly) as if they are exactly that.
6. They deny humans are anything other than entirely creatures of nature, yet insist that what humans do is somehow a threat to nature or some supposed natural balance.
7. They insist humans are categorically the same as any other animals, but then decry it when humans treat other humans the same way other animals treat their own kind (alpha male brutality, violence, etc), as if humans have some sort of obligation to “transcend” their “animal” nature.
8. They insist that physical facts are the only meaningful truths that exist, but then want to use force of law to protect subjective concepts that contradict physical facts, like “transgenderism”.
9. They insist spiritual laws that transcend the physical do not exist, but then insist that all humans are equal, when they factually, obviously are not equals at all – either physically or intellectually.
10. They pursue social systems that attempt to force the concept of equality on everyone as if they expect that through ignoring the physical realty of human inequality they can build a sound social system, which would be comparable to ignoring the inequality of building materials and insisting that they all be treated as equal when building a skyscraper.
In about a century – possibly shorter – the men of the future are going to look at us, and think why we went utterly nuts.
This list will go a long way in explaining why. A few tie-ins to the lunatic (and highly secular/atheistic) 20th century, and they’ll shake their head in understanding… and pity.