Q about arguments for God's existence.

[Jackalope]

The reason some of us call you lot idiots is because of statements like that. Experiments can be devised to test for the presence and influence of dark matter (and dark energy). Tell me of an experiment to do the same for a god.

Incidentally, for the record: I happen to be one of those people who find the dark matter hypothesis unsatisfying. It strikes me as far too conveniently ad hoc. However, I am willing to listen to the evidence from those far more knowledgable of the subject than I will ever be.

I wonder if gravity works differently at the very very large scale, like things are different at the quantum level?

There's a theory for that: http://en.m.wikipedia.org/wiki/Modified_...n_dynamics

Others are also working on unified theories to reconcile quantum theory and relativity:
http://en.m.wikipedia.org/wiki/Grand_Unified_Theory - seen as an intermediate step to a Theory of Everything (in physics).