Why don't people just make up their own religion?

[MilesTailsPrower]

I've never really understood any of this religious stuff, but I always wondered why people cling to a religion made up by somebody else? What if you don't like what will happen to you after you die? What if you didn't want to see jesus but just wanted to go to another place. Why does Christianity have a predetermined place for you to go when you die? Well since I live in america, wouldn't it be easier way out to just make up your own religion where you don't have to be good or do anything on Sundays to get into your so called "Heaven"? Is the reason people don't make up their own religion because they are lazy or just the way they were raised to believe in their parents god. I think if you had your own religion with a "god" that doesn't judge, doesn't send you to suffer for all eternity you would be a happier person. I mean it's not like religion ever did anything good for this world all it does it cause wars. As George Carlin talks about the Big Electron, doesn't punish, doesn't reward, doesn't judge at all, it just is THE BIG ELECTRON.