I only read the opening post. Forgive me if I am retreading ground.
"these are both theories and have evidence but not enough to make them facts"
You obviously have a misunderstanding of what a theory is (and most Americans do). In science, "theory" is practically synonymous with "fact" (as far as laymen are concerned). There is enormous evidence for big band and evolution, /even more than there is for gravity/. Let me type that again, because it is important. There is /more/ evidence for evolution and big bang than there is for gravity. Try to let that sink in for a minute, and consider then, if you are willing to accept gravity on such little evidence, why would you reject scientific theories with much more evidence?
The prevailing reason that creationists et al cannot reject evolution is very simple: /the entire modern medical field is based on the fact that evolution is true/. If evolution were false, modern medicine would not exist as it does. Period.
So why do we hear that evolution, big band, etc, are "just theories?" It seems rooted in the colloquial speech where a hypothesis and theory have become synonymous. Let me appeal to the great Theodore Sturgeon (a science fiction author, I might add): "Here's the point to be made - there are no synonyms. There are no two words that mean exactly the same thing. I don't care about the dictionaries of synonyms and antonyms. If there were two words that meant exactly the same thing, there wouldn't be two words. That means that every word you use has a certain amount of semantic or psychological freight that it carries that makes it different from other words." Suffice to say, a hypothesis is not a theory, no matter how good of a screen play it makes.
But really, if we were going to base which theories to teach based on the evidence, then we would teach the ones we are already teaching. Here's a simple formula for deciding whether a theory should be taught: e*T, where T is the theory in question and e is the number of evidences supporting it. Any theory with a value "> 0" should be taught.
Evolution: e*T = (astronomical number)*Evolution > 0
Creation: e*T = 0*Creation = zero*Creation = 0
Aliens: e*T = 0*Aliens = zero*Aliens = 0
Big bang, gravity: (not zero)*T > 0
Hm. Well, that sure does help me know what to advocate at the next PTA!
But seriously, gravity is less well attested than the two major cosmological scientific theories that religious and conspiracy nuts are trying to undermine. Unfortunately, their alternative "theories" (see those quotes? That's because /they aren't theories/) are less well attested than gravity.
Let me also reiterate, /medical science doesn't work if evolution is false/. </soapbox>
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