@charles m young,
Should our Brains stop thinking, would we cease to exist?
I have, at a point, stopped my brain from thinking, incurred no thought whatsoever and kind of let myself be.
I remained in existence, but the truth of the self had no verification amongst naught.
If death is our brains ceasing thought, well it isn't very scary then.
The purpose of life is defined through your perception on existence. Should it be based on religious or social origins so long as you are able to express positive emotion in this purpose I believe it is one you should find foundation with.
No matter what, everyone's subjective view will define life's purpose. If you have found a purpose for your self that harms no others in the way then this would seemingly be a beneficial, or otherwise, a wise choice in purpose in life. For we live mainly for our own survival, and for the benefit of the survival of our loved ones. Should we harm others in order to achieve a purpose we are rejecting the idea that those we harm aren't as loved as those who we love.