h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

I think their existance is necesary for the following reason.

All possible worlds are equally possible. Therefor, what is to make one more real than another? They must all be equally real. Since we think this one is real, all equally possible worlds must also be real. Thus, all possible worlds exist and are as real as this one.

I feel I must attack your second premise here. Just becasue a world is possible, why does that mean that world has anything to do with reality? Our world isnt real because its possible, we only know its possible because we first know its real. Possibility has no bearing on reality.

If possibility isn't a sufficient condition for reality, what is? What causes some worlds to be real and not others, if all are equally possible?

We can't blame it on God, because then we have a simialar problem--if more than one God is possible, what makes on real and not others, if all are equally possible?

I don't quite understand what you mean. Some things are true, and other things arn't true. You can't just say all things are true and real just because they might be true and real.

If we are to claim that our universe is more real than alternate, equally possible universes, then we need to have an explanation for what the selection agent is--ie, what makes ours more real than others.

Unless we can justify why our universe is more real than an alternate one, we have to assume they are of equal reality. Since ours clearly exists, so does the alternate universe.

But my criterion of reality is actual existence. Epistemologically its impossible to assert that other possible realities are more or less real than this one. Im just saying we can only be sure that ours is real, and have no reason to say that others are.

If the others are not real, or cannot be treated as real, then how is it meaningful to argue that the presence or absence of a God in them means anything in our own. If our world is real and those worlds are not, then why do they matter at all?

My point is that IF they were real then God would exist in them. It doesnt matter if they are actually real or not. I am using their conceptual reality to illustrate a point of a being's existence in our reality.