Personally, I think it is because you think you are real and that deep down you think you exist as a real entity and that awareness is so strong that you can’t act consistently with materialist beliefs.
You think you are a real being. Now it is obvious that the “material you” cannot be consistent yet there you are, a consistent stream of being (ok you can sleep etc. but when you wake up you are still you).
That is why you apply personal pronouns and identity to yourself.
You falsify the materialist world view by acting the way that you do.
It’s kind of obvious that whoever wrote this doesn’t really grasp what the “materialistic worldview” is. For that reason I’d be tempted to just shrug if off, but it strikes me that you could turn it around.
1. You believe that all human beings were created by God.
2. The Bible actually gives no reason for Him to do this. Apparently he just looked around at the empty universe and did it because there was nothing else to do. The Bible says that the only purpose for our existence is to serve God and praise Him.
3. In the Bible, God doesn’t seem to intervene much in human affairs, but when He does, He does so capriciously. He might send plagues to Egypt in order to force the Pharoah to free the Israelites, but then He is just as likely to send a plague to the Israelites if they disobey the slightest commandment, or for any reason really. The same pattern seems to hold true today. He might perform a “miracle” here and there to save someone undergoing surgery, but then the next day do nothing whatsoever to prevent a mad gunman from shooting up a school.
4. Therefore it is pretty obvious that God doesn’t really care much about human lives. They’re just something for him to watch when he gets bored.
5. And even when you die, what do look forward to besides an eternity of simply praising God and… well that’s about it really.
6. Therefore nothing that you ever do in your life will ever make a thimble full of difference in the long run.
7. So why do you get up in the morning?