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.