Hi, Exexpat! [waves] Hope youenjoy the rugby, NF! 
Right - to your points, Exex:
Yousay: "Holofernes, would it help you to understand how atheists see Christianity if you imagine yourself, a Christian, picking up a book of Islamic, Hindu or Buddhist theology, or a manual on astrology, or a homeopathic reference book and reading them with an open mind. I think you would find that all those things would be perfectly consistent and logical within their own frames of reference."
Yes - so far so good! 
"But if you come to them from the starting point of not accepting their main articles of faith (in Allah/Mohamed, the Hindu pantheon, Buddhist scriptures, the idea that celestial bodies influence individual lives or that water has memory etc), then they are worthless except in terms of understanding whatever cultural influence those particular belief-sets have had in the ancient or modern world. They don't have anything relevant to say to you on how the world should be interpreted or how you should live your life."
Hmm---what I would say to that is that I beileve that there is truth in all religions, but (as a Christian) that truth is most fully revealed in Jesus. So no, they are by no means useless. I'm involved in inter-faith stuff and love talking and learning with people of the other faiths. I find that people from other faith traditions often have things to say that are highly relevant to how I live my life! 
"All the complicated theological debates going on in Christianity are just as meaningless to me as the same things going on in, say, Buddhism, would be to you. Nothing more than hot air and paper. If you take away the foundation they are built on - faith in a particular God - they fall down like a house of cards."
Hmm---I don't know a great deal about Buddhism, so can't comment on that specifically. But I am a thinking person, and can apply my mind to issues which have as their foundations things that are very different to my foundational beliefs. I've travelled a lot, and learnt how to see life from all sorts of perspectives, so I can enter into (for example) how the logic of church leaders in conservative evangelical Christian South Korea works, against its background of Confucionism and conservative evanglicalism. I am neither Confucian nor conservative evangelical, but I can follow the logic of those who are, and see how it ends up with a cetain model of leadership (not one that I am comfortable with - but which I do understand). You sound intelligent enough to follow logic you disagree with...it's more often a case of whether one is interested enough to enter into the thought-world of the other, not whether one is able.
"faith in a particular God..." This was my 'lightbulb' moment earlier when I was reading ch. 3 of the God Delusion (which I'd love to discuss) - Dawkins seems to take 'belief' to mean 'assent', whereas the New Testament Greek word 'pistis' which can mean 'belief', means trust much more often (I could say much more about this if you like). So it is much more about personal response than mental assent. Do you see? The Hebrew words are even more relational - there is no concept of 'believing in God' as a process of abstract mental assent at the time the OT was written. This changes the nature of the discussion. If you treat somehing that is relational as though it is cognitive, you've fundamentally misunderstood its nature.
How would you respond to that?