Shia Islamic Argument for the existence of God

[robvalue]

We only have one reality we can observe, and we have no way of knowing if any of our logic or knowledge makes any sense to it externally. Simply insisting that it does is just assuming the conclusion.

"Finite realities only exist within certain conditions"... what does this mean, and where did this information come from? We don't even know if our own reality is finite or not, and we certainly don't know what requirements there are for it to exist. This is just plain making stuff up.

Our reality being the only one presents no logical problems. I'm not saying it is; just that you can't rule it out with mere logical arguments.

What is a deity anyway? Can a slug be a deity if it unwittingly created everything else from nothing?

And why should I care about any of this?