"Why are we here, and why is God absent?"
Why we are here, I don't think we can ever find out during our lifetimes ... unless something phenomenal happens, like a NASA deep space probe running into Heaven's front lawn, as an example (and admittedly, a very geocentric example). Our situation is like that of a goldfish in a bowl in someone's living room, trying to ascertain through observation, meditation or prayer what the heck it's doing swimming it's life away on someone's bookshelf.
Now as for why God is absent, I would like to ask: IS God absent? What does it mean for God to be 'present', anyway? Does it mean seeing an awesome vision of a bearded guy in a flowing white robe? Or maybe a prophet that can perform true miracles and unequivocally convince EVERYONE on Earth that he or she represents God? Drawing on the blind chihuahua symbol of this web site, why assume that God is absent just because our vision is poor?
Personally, I believe that fear-based religions like Christianity - Do what the Boss says, or you gonna pay! - actually make it harder to 'see' God, because they define God in an unrealistic and unnatural way. I found this web site by googling my way to the excellent essay "Leviathan, Inc.", and I find that the problem of "managerial arrogance" described there is rampant within large religious organizations, as well as in corporations. Because followers of a faith have to conform to acceptable behaviors in order to be welcome within the institution, honesty is an automatic casualty, as it is in the corporate world. The mafia-like phrase at the start of this paragraph (about listening to the Boss) applies in both cases.
Carrying on with the corporate comparison, the near elimination of American Indian spirituality by Christian organizations could be compared to small, local businesses that have been wiped out by the likes of Walmart, Chapters etc. Small businesses tend to value people, instead of treating them like small, replaceable parts in a big machine. Do you think that the American natives of three hundred years ago felt that God was absent? They were savages practicing animism, you may say, but keep in mind how our 'civilisation' of today will be seen a thousand years from now. Just because the past is behind us doen't mean we know very much of all that there is to know ... and maybe it's even less than those 'savages'.