Hi Seras,
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I'm not particularly fond of dogmatic theists or athiests either...or dogmatic agnostics or dogmatic philosophers for that matter.

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Personally, I'm agnostic...but I'll try my hand at arguing the athiestic viewpoint here:
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The true scientific and philosophical opinion on this ought be agnosticism..
First: Science and philosophy are two very different disciplines.
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Philosophy: (definitions per Webster)
"all learning exclusive of technical precepts and practical art"
"a search for a general understanding of values and reality by chiefly speculative rather than observational means."
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Science:"knowledge or a system of knowledge covering general truths or the operation of general laws especially as obtained and tested through scientific method"
Scientific method:"principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of hypotheses"
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Essentially, in the day-to-day life of individuals, science is about being practical. This is what we know, and this is how we know it.
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It is on the back of anyone who makes any claim to show it to be true..
I don't believe in the Jabberwocky. Though I'm sure Mr. Carroll doeth protest while he sits under the Tumtum tree with his vorpal blade. Fairy godmothers? We'll have to confer with the knowledgeable brothers Grimm about that one. Zeus? Let's ask the ancient Greeks. Baal? The Canaanites. Chalmecatecuchtlz? The Aztecs. The christian god? A priest.
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The imagination is a wonderful thing. It can come up with countless things that do not exist. Your assertion is that we should implicitly trust philosophy for all knowledge. This means believing nothing...nor ruling out anything ever. As such, it is a state of no knowledge...nothing is ever certain.
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Uncertainty does not lead to action. It leads to sitting on a chair just coming up with more thoughts. If Chalmecatecuchtlz exists...then we risk his wrath by not sacrificing people to him. If he does not exist, then he can be safely ignored. By not taking action, you are taking a side...that of believing there is no risk (or not enough risk). You're hedging your bets on non-existence, even if you tell yourself that you can't know with 100% certainty. It's far easier to dismiss the long forgotten god of a dead society than the current incarnation of our own society. If all things are equal in your premise, to a philosopher such should not be so. Though...what benefit is there to endless debate about the existence of hundreds of dead gods and goddesses? It fills time...but to what end?
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Further...if philosophy ran science, what would we have today?
Phrenology? Alchemists still attempting to turn lead to gold? Barbers bleeding patients because some patients do get better after they rebalance their humours? Music of the spheres? Earth as the center of the universe because it was thought that it said so in 'The Book'? Nothing is certain...so everything is acceptable...unless you can prove 100% that it's not true...or never works.
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Science is there to give us guideposts...a raft...in the murky sea of reality. Sure...the true reality is that nothing can be known 100%. Dogmatic athiests don't trifle with the "well...Chalmecatecuchtlz could exist...he really could." It wastes time. There is not even so much as a grain of proof. It wastes thought. It's not worth contemplating. The burden of evidence is upon the believers to provide...it's not the athiest's obligation to waste their time with every figment of the imagination that others come up with. It's basic scientific method. There's no definitive empirical evidence to even begin from.
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As far as god is concerned...if the past is any indication of the future...one day our society will be no more, and their god will cease to serve as anything but Homeric literature for future generations.
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Ok...that's my best shot at the athiestic point of view. You seem to be a philosophy major looking for a little philosophical scuffle...so I hope that's what you were looking for.