I don't know, I just never did like the idea. Life is a tiresome thing, and the world is a sad place with a sad history. I never could find peace in the idea of having a family, a big house, or money. I used to do research into the Sasquatch phenomena a few years back, even been to the places that they have been to but never did get to see one, not yet anyway. Got to know a lot of people that lived for things like that(Studying the Sasquatch), they did it for free, and most of them didn't even choose to do it as I did, they just sort of fell into it(Wound up seeing one on a camping trip, or a few people I knew who actually had the fortune/misfortune of moving into a house right smack dab in their territory, in swamps and such). There was a time were I was like most people and thought it was all baloney(As a matter of fact I never thought about it), I eventually found out different.
They are quite real. That was a life changing time. Here is something that most of the world thinks ridiculous, and that modern science has yet to "discover". Right under our noses for thousands of years. Not even that rare, and huge in size. Loud and curious. One is probably spotted by a person in North America every week, hair samples have been collected, as well as fecal samples, but still they elude our "discovery". I moved on to the extraterrestrials from there, but have never witnessed a "UFO" or met with a "Alien" myself, maybe someday I will but I won't hold my breath to that XD
I have learned with time, that most of what we "know" via observation and science is as you said, a mansion on the sand. It is based on nothing, and will not go very far. All of the theories of today will peel away to reveal new ones, probably within the next few revolutions we will even had that big Theory of Everything we have been striving for all of this time, the point where all of our sciences, studies, and theories come together into one great big one. I see that Religion and Science are coming together quickly, they complement one another.
Then why try to do anything if it will almost always fall away I thought? I think that it is enough reason for a person to enjoy doing something, if it brings them peace and happiness and they hope/do it to be a service to those around them, it keeps humanity moving forward. In our universe, what is not moving forward, is moving backwards. I believe that all of these religions have some fantastic value, and that they all fit together/were meant to, and that if understood properly they are a benefit to us and our understanding. Perhaps even the entire Universe itself is a living thing, a consciousness I think. Think if it as a hobby, some people watch football, some people play video games(Lord knows I do!
), and some people "search for Sasquatches" so to speak lol. On this world we have serious problems surrounding us, corruption, mass genocide, greed, tyranny...a unbelievable planet and most of it's population turns a blind eye, if a person can set themselves up so that their hobby/happiness is to solve any of these thousands and thousands of serious problems, they will be truly rich.