Science isn't a belief, it is a collection of theories that describes natural phenomenon. It tells us why the sky is blue, why rivers flows downhill and apples fall to the ground, why the sun can shine for billions of years, why there are extinct volcanoes, why Mount Olympus on Mars grew so high, etc, etc.
There are laws in science, and theories describe them Science stands by the best theory for each law until someone can give a better description and usurp it. If people want to attach themselves to something someone made up then that's fine, but having that crutch, whether it be some 'energy' or a god, in my opinion holds people back from really exploring the beauty of everything, and why it is what it is, objectively. People always go for the easiest option and just because we are alive by incredible luck, I mean the chances of anyone being born as they are longer then winning the jackpot on the lottery. But to be born is a developed country like the UK, which lets be honest is one of the best in the world, instead of say Afghanistan further increases your luck. But to be born in an age where science is progressing exponentially to make our lives even better (that is subjective but I believe we are better off now then if we had lived 200 years ago), your luck has just gone through the roof. And to be born into the most intelligent species on the planet, well...
So with incredible opportunity that having a homosapien body gives, what do most people choose to do? Believe that this life of 70/80 years isn't enough and arrogantly and greedily want to live forever. Make the most of this beautiful planet, solar system, Universe in the time you have. In a few billion years the atoms in your eye reading this maybe hurtling into an oncoming Comet. In that sense you do live forever, it's just that you will be scattered across the Cosmos, in trillions of little pieces.
I think we should divert back to science in this thread. One thing that amazes me is how all the cells in our body work tirelessly to keep us alive, and sacrifice themselves when a code tells the too.