I do think it's important to distinguish between intentionalism about consciousness and externalism about consciousness. Intentionalism says that consciousness is a form of intentionality - the representation of things to the mind. Externalism says that these things have to exist in order for them to be represented, or presented. These are different views.

Taken as hypotheses, religious claims do very badly. Yet the striking fact is that this does not worry Christians.

Naturalism is a methodological rather than a metaphysical view. It's because I am a naturalist, actually, that I am sceptical about physicalism.

One odd thing about the current debate between religious people and atheists is that the participants don't seem to care that they entirely fail to communicate with the other side. They therefore have no account of why the religious or the atheists believe what they do, except that they are stupid or deluded. I think philosophers should try and make sense of their disputes with their opponents as far as possible without treating them as idiots. This applies to the religious participants in the debate as much as to the atheists.

Since I don't believe in externalism, I don't think it can explain consciousness!

Problems come and go over time, and to understand why is a difficult historical task. If one wanted to find the origin of a problem, historical research and close attention to texts is what is needed, not unconstrained speculation about the 'pictures' that philosophers must be in the grip of.

There are no a priori obstacles to the scientific knowledge of the mind, but the scientific knowledge of the mind is not all the knowledge of the mind that there is. This is not an objection to science, it is just a distinction between different kinds of knowledge.