I made an aside reference to Anselm because he made an argument which was supposed to prove the existence of God. Not a cosmological one, agreed. Anyway, I have to say that it was clear to me why A's argument failed (even if Bertie couldn't see it) - it's all about the imprecision of language. You theological chaps are all too keen to use words like 'perfect' and 'greater' as if they had some absolutely precise meaning when applied to being or beings. Gabriella, in one of her extremely lucid posts, has already pointed out the meaningless nature of this approach when applied to Jesus, calling him the 'perfect' man. A being "greater than any that can be imagined" is similarly meaningless. You might as well say "hairier than any that can be imagined". Russell's final remark above I agree with.
So, to make sure that anyone else who wants to get on board knows the theme: you're on about arguments from contingency and necessity, mixed with tangential references to arguments from "the hierarchical, sustained first cause" and the classic first cause argument. I imagine that the majority of people would be bored to death by such matters, and that their atheism is more likely to result from questions of theodicy (how can there be a good god when there is such evil in the world)
I've argued Anselm before with someone. I think he tends to talk in terms of the maximum of any common trait. So any good quality and God is maximally that particular quality.
Theologians, I think aren't as big on the ontological argument and even I recognise it as iffy.
But then there is Socrates who said that if the perfect man showed up he'd be put to death, reflecting something about divinity that is abhorrent to people. I think divinity gives Jesus a quality that people abhorred that is pretty unique. Maximum holiness which people hate because they are anything but.
So if Jesus isn't divine and human then he's just a very good, pious and outstanding man. I think that is the view of Islam. Of course neither Islam nor Jesus as a good man christianity can further Jesus if as Dorothy L. Sayers observed, people think Trump or Stalin or Hitler is more outstanding a m,an.
I don't believe i've ever used the term greater than can be imagined.....but I wouldn't , perhaps baulk at using the term ''greater than can be imagined by people on this forum, evidently'' .
If atheism is asking ''how can there be a good god when there is such evil in the world'' it does so with a shrug and a ''Nuffing to do wiv us, guvnor'' and an oft stated morality which according to some is like a matter of taste.