Sorry - I made an assumption, which was that I was talking to a Christian. Usually I'm arguing with Christians. Well, this is good. I like Muslims.
It sounds like we're basically in agreement. I'm saying the shape of the belief is the image, and I'm saying that the person can be an image of God, or an image of some other belief, but can't be both. The idol is in the person, and **_could be_** an object, but still would have to be in the person first. An object may have metaphysical significance to one person and be an utterly meaningless lump of matter to another. So where's the idol? Its in the person.
Even that's still not quite right - I think it mostly works, but even if you give metaphysical importance to an object, it could still not be an idol, if you understand that its still no more "real" than any other materialist beliefs, and even if there are some tangible effects. If you net out the 'this way' and 'that way' of it, I think the result is that physical idols are just stupid, but I'm trying to make that nuanced point because I think its wrong to assume an object is an idol. Like you said, only God knows your heart.
But I'm surprised... I once saw a video of a scholar of Islam saying its not belief that matters, but actions. Isn't that the position of Islam?