quote:
Well you can’t call them a theist because they don’t claim to believe in an deity that is engaged in any sense with creation
So we can call him a theist in the general sense, which includes Deists. As your quote says:
Theism is broadly defined as the belief in the existence of the Supreme Being or deities
That broad definition is clearly right.
quote:
I don’t understand the objection to using the term agnostic. It certainly seems to fit the definition used in the last sentence of this wiki quote.
The obvious objection is that it doesn’t describe the position that you’re asking about. He can be an agnostic as well - provided you allow that atheists can be agnostics too (and a lot of people don’t). But it doesn’t describe the fact that he believes that there is a god of some sort.