That's why I say it does not make it obselete though, I just feel it does undermine it. The theory of how the universe was created is certainly not something that we can definitively say is correct (indeed it is highly unlikely despite all of equations and science behind it that we are correct - I just think they are probably at least in the right ballpark) We are basically working with a lot of unknowns. I simply think what we do know scientifically, seriously undermines the supposed existence of some greater being. It is possible but based on what we have an understanding of, its seriously unlikely. With science its based on many unknowns as you say, but there is a hell of a lot going on in the physical world which we do understand, and which helps us form a more rational opinion. I do not think it is possible to say "God does not exist" and prove it.
The teachings of religion are just a non starter. Regilious groups have tried to move the goalposts so many times over the years to justify their accuracy. Its a load of bollocks which has been smashed to pieces by science. I find it difficult to seperate the teachings from the possiblity of Gods existence. The possibility of his existence came about through the teachings. Therefore because the teachings are beyond flawed, Gods very existence is highly dubious!
I have no problem with religion by the way, each to their own. I see religious teachings as our attempts to bring order where there was chaos, and basically a primitive human attempt to explain the age old problem of how we came to be.
You see what you've done, you've dragged me onto this again!