Okay, Diogenes the Cynic, we’re getting close … 
One of the ironies of this discussion is that I’ve never believed in Santa Claus and I think that instilling that belief in young children is similar to instilling a belief in god, and is not a good thing. But, there are many other atheists who have no problem with perpetuating a belief in Santa Claus in children.
Another irony is that, with all of our talk about burden of proof, it’s the atheists in this thread who are making most of the claims.
I questioned Chief Pedant’s post (#44) because he uses an incredibly weak argument to equate a belief in Santa Claus with a belief in god, when he is presenting what are purportedly “the most convincing arguments against Santa Claus”, namely:
- That he is a human invention.
- That no magic has ever actually been shown to occur.
- That there are dozens of obviously invented traditions around him.
By extending the analogy, he is saying:
- That god is a human invention.
- That no magic [by God] has ever actually been shown to occur.
- That there are dozens of obviously invented traditions around god.
The theist has not said these things because no theist participated in his post.
Are you okay with this so far?
He is presenting a didactic exercise for theists, but the request in the OP (and in this thread’s title) is for “the most convincing arguments for Atheism/against the existence of God.”
So what’s Chief Pedant’s argument? In essence, it’s: Whatever a theist’s reasons are for not believing in Santa Claus, those are the same reasons for a theist not believing in god.
I don’t buy into that argument. He hasn’t demonstrated to me that a belief in Stanta Claus is the same as a belief in god. Yes, there are similarities, but that doesn’t make them the same, and he hasn’t provided a convincing argument that they are the same: not convincing to me, and, I think, not convincing for theists.
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God is a human invention.
Really? The way that “science” is a human invention?
Or is it that god exists and people have formed many opinions about his existence?
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That no magic [by God] has ever actually been shown to occur.
That’s a claim, an assertion. According to your cite, DoC: “The burden of proof is always on the person asserting something.” So, where is Chief Pedant’s proof? Oh, it’s not his assertion – it’s the theist’s assertion about Santa Claus? But it’s not the theist’s assertion about god. (Actually, it’s not even the theist’s assertion about Santa Claus: It’s Chief Pedant’s guess about what a theist would say.) The theist can rightly ask the atheist to back up the claim that there are no miracles, and the atheist can rightly ask the theist to back up the claim that there are miracles. (If the atheist wants to appeal to David Hume, that’s his choice.)
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That there are dozens of obviously invented traditions around god.
So? There are dozens of obviously invented traditions about the stars. Does that mean that the stars don’t exist?
(Again, I’m not saying that this is an argument for the existence of god. But “dozens of obviously invented traditions” is not an argument *against * the existence of god.)
The final irony is that I think that many atheists “don’t seem to have much familiarity with logic.” Or, if they do, they let their emotional biases get in the way of a rational argument. (As do many theists.)
One last thought: Do you really think that intelligent, educated theists are going accept any part of an “argument by Santa Claus”? Do you think they’ll say: Wow, I’ve never thought about *that * before!! *Now * I understand the error of my ways!