system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I don't understand how anyone can accept their mortality.

The sheer thought of not existing is the one of the few things with the power to make me anxious and sick to my stomach. I don't believe in god or the tooth fairy, and all evidence seems to point to the fact that once our brain is gone, we're gone. I'm really jealous of people who firmly believe they're going to heaven and will live happily ever after, but at the same time I find that kind of comfort to be...wrong, and dangerously so.

For one, if this life is all we have, the rational response is to extend it, ideally forever. If you don't believe that, then you don't do that, and you don't advocate for that. You might even actually advocate against that. If you're wrong, and if immortality is possible, advocating against it is akin to advocating the genocide of the human race. 

Tbh, I don't particularly understand why some people are so religious and have such faith in this happily ever after, with no evidence whatsoever. To me this life is more than enough, simple pleasures, the ability to think, I could do it forever. I don't understand why there isn't more uproar about it.
gpt
What's the point in refusing to accept something you can not change? People have been looking for immortality for the entirety of human existence and we are as far as ever. Why spend your life looking for something that you can't find?