There’s about 7.7 billion people on earth. If you eliminate one person every 10 seconds, it'll take you 2,500 years to eliminate all on earth. Jesus lived 2,000 years ago. That means, if once you saw Jesus coming, you started knocking people off one by one every 10 seconds, you continue to need another 500 years to end the work .
55 million people die every year. That’s about 2 deaths per second. In the time I took to write down this sentence, 10 people have died. By the top of today, 150,000 people would have died. Every six weeks, the whole population of Singapore of 6 million people is exhausted .
The total number of humans in history is estimated to be 100 billion. That means only 7.7% of everyone who has ever lived is alive today. 92.3% are buried under our feet.
Behind each of those deaths was a father, mother, friend, lover, son, daughter, brother, sister, musician, doctor, teacher, inventor, business tycoon, king, emperor, thief, robber, rapist, murderer, dictator, lawyer. Behind each of those deaths was someone who lived a life not unlike yours. Each with his or her own struggles, dreams, hopes, fears, dissapointments. Yet what’s left of these 100 billion lives?
Perhaps life isn't about achieving the lofty greatness of Shakespeare or Einstein or Napoleon? Perhaps life is about your personal impact on others instead of humanity as a whole? But is that so? You probably remember your grandfather but what are you able to tell me about his father? Does anyone still remember him or has he faded into oblivion? That even his name has been forgotten much less his deeds? And why wouldn't it be any different for you or the 150,000 which will die today?
That’s just human lives. But the scope of life is larger than simply human lives.
Remember the dinosaurs from Jurassic Park? That was 150 million years ago. Those were living things too. Of course they now power your cars.
In fact, once you start including other living things, the picture gets worse with 99% of all species that has ever lived on Earth (~ 5 billion species) extinct.
With this in mind, and considering the amount of living things and unimaginably long timespan, does one really think there's any purpose to life? By purpose I assume you mean “meaning” or “reason” for existing? There is none. Nature is a blind machine.