Interesting topic Brokeback. Eternal life is the main hook of most religions. I like the way the article you linked to stressed that existential anxiety is normal and part of our life. We have to find ways to deal with it. Excellent that they say it's evolved from what does God want from me, what is the purpose of life, to what is the purpose of my life. That's the way I cope with existential angst by making my life purposeful. Over the years my purpose has changed continually since leaving the JWs. At this point in time I'm trying to have more fun and make more friends. In the JWs that would have been seen as a very selfish life purpose, but what do they know.
Death is not something that I worry about. I think most people think they are going to live forever anyway perhaps until they're older or a sudden severe health problem frightens them. Although I think it's normal to think about our eventual death and wonder what it's all about, religion has made this much worse over the centuries with talk of judgment, punishment, hellfire or other torments. Religions have hijacked our existential anxiety for their own ends.