Re: God is Not Great
Hold on to that laugh a bit philsophy chanda!
Perhaps some english lesson would help 
Checkout the synonyms section in the definition # 2 at the following:
Theory | Define Theory at Dictionary.com
Here is the exerpt from there for your reading pleasure:
- a proposed explanation whose status is still conjectural and subject to experimentation, in contrast to well-established propositions that are regarded as reporting matters of actual fact.
Synonyms: idea, notion hypothesis, postulate. Antonyms: practice, verification, corroboration, substantiation.