I don't think my parents would have went into the religion has it not have been for my grandma dying. My parents had studied for a couple of years before my grandma died and they made no progress, but I think when she died, their bible study conductor used that fact to lure them in. My dad got baptized within a year of my grandma dying and my mom quit smoking and began seriously studying when that happened.
I don't think it was their fear of dying, but it took someone close to them dying and the hope of seeing her in the "resurrection" to make them believe.