Light Travelling said:
True, there could be an infinite number of other unfounded assertions, until you apply the other critera that the god concept carries with it;
* The concept appears in all human cultures and in all parts of the world
This is incorrect, there have been and are many cultures that do not have a "God" concept.
Buddhism and Taoism, for instance, do not contain a belief in God. There also have been many animist religions without a central "God".
But the argument itself is fallacious (argument from popularity). Truth is not determined by democratic vote or poll. If 6 billion people believe something that is false, it is false despite their belief.
*And at all times in history for at least 5000 years
Again wrong (see above).
*There are thousands of 'witnesses' through time who claim communication from or experience of god.
Testimonial evidence is terribly weak and prone to tremendous errors. Few, if any, can completely agree upon the specifics of these supposed communications which does not speak towards their validity.
*The concept of god has fundamental implications for the nature of reality, life and us.
Argument from consequence is a logical fallacy. Implications do nothing to verify the truth or falsehood of a statement.
Now when you apply this critera to all those other unproven assertations it really doesn't leave you with many does it. So that goes some way to answereing your question on how one selects what to believe.
I've already demonstrated why they are problematic, but let's examine:
The concept that the Earth is flat has existed in most human cultures, all over the world.
And at all times in history for over 5000 years.
There are billions of 'witnesses' that can testify that the Earth appears flat.
The concept of a flat Earth has fundamental implications on the nature of reality, life, and us.
As you can see here, none of your "criteria" have any relevance to the truth or falsehood of a flat Earth.
OK so lets make a list of all the possible theories that have been put forward;
1. Some form of god / creator / supreme being / geater consciousness brought it into being.
Now choose what you would like to use as your base assumption.
First of all, scientifically, this is not a theory. It's not even really a hypothesis as there is no way to disprove it.
Secondly, this answer tells us nothing. There is no information to be drawn from it. It does not explain where the energy and being-ness came from, it merely states that it pre-existed in God. It does not explain what God is, how God came to be, or what God is doing now. It carries no predictions upon what might happen in the future. It is basically a useless assertion unless one tacks on a bunch of other concepts.
Alternatively we can look at the Zero Point Energy theory or Brane theory. While they are on par with the God hypothesis as to source of origination, both of these theories are extrapolations of factual evidence. And they not only are capable of explaining the current state of the Universe but are predictive as well.
Matching point for point I have to go with ZPE or Brane theory over the God hypothesis.
~Raithere