What is the purpose of life?

The purpose of life is not not to die, but to evolve forever.
To even begin to have a chance at becoming immortal, you would have to find a way to back up the contents of your mind.
All this data should be migrated to a more durable medium than a human brain.
Unfortunately, we can't just plug in a USB drive. It would have to be reverse engineered.
To make a long story short, your most detailed possible diary would become your future self.

That sounds like a worthy goal to aspire to.
Record everything about yourself to fully become yourself.
Then, become a self-perpetuating logical pattern.
In the long term, this would not be religion but science.
At the moment, such a project would be entirely faith-based.

The religious problem

The most important problem in existence is the thing we least want to think about.
When you look at the big picture long enough, the phenomenon of existence becomes completely unacceptable. It's the ultimate and only cataclysm.
The number of possible horrors is absolutely unlimited, and they will only get worse without end.
True, we can reasonably expect things not to go TOO badly wrong while we're still alive.
What if there ISN'T nothing after we die, but infinitely more chaos? Why would we expect things to start making sense then?
We are barely at the beginning of an infinite journey.