Sure, I agree that we make use of all kinds of contextual cues to interpret speech, and a system lacking awareness of that context will have trouble interpreting speech.For example, if I say "Do you like that?" to Sam, when Sam can't see the thing I'm gesturing to indicate or doesn't share the cultural context that lets them interpret that gesture, Sam won't be able to interpret or engage with me successfully. Absolutely agreed. And this applies to all kinds of things, including (as you say) but hardly limited to pointing.
And, sure, the system may not even be aware of that trouble... illusions of transparency abound. Sam might go along secure in the belief that they know what I'm asking about and be completely wrong. Absolutely agreed.
And sure, I agree that we rely heavily on physical metaphors when discussing abstract ideas, and that a system incapable of processing my metaphors will have difficulty engaging with me successfully. Absolutely agreed.
All of that said, what I have trouble with is your apparent insistence that only a humanoid system is capable of perceiving or interpreting human contextual cues, metaphors, etc. That doesn't seem likely to me at all, any more than it seems likely that a blind person (or one on the other end of a text-only link) is incapable of understanding human speech.
A few notes about the site mechanics
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Once a post gets over 500 comments, the site stops showing them all by default. If this post has 500 comments and you have 20 karma, please do start the next welcome post; a new post is a good perennial way to encourage newcomers and lurkers to introduce themselves. (Step-by-step, foolproof instructions here; takes <180seconds.)
If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post.
Finally, a big thank you to everyone that helped write this post via its predecessors!