Question

Good evening!
Franz Brentano argued (and is therefore considered a precursor of Husserl) that there is no thought that is not focused on an object; that is, one cannot think about nothing. And early Wittgenstein went even further and argued that there cannot be a thought about nonsense, and that it is impossible altogether to think such a thing.
If so, it is difficult for me, because Carnap argued that there is no meaning to concepts like “God,” “spirit,” and so on; rather, they are nonsense that slipped into the (conceptual) dictionary because of conceptual confusion (but they do not describe anything empirically, and therefore have no meaning as concepts). If so, how can one think about such a concept at all, if it is nonsense? Is that itself his intention—that indeed we are not thinking about anything? But surely we are thinking, so is our thought empty? (For were it not for Franz, I would have said that indeed we are not thinking about anything; but according to him one cannot think that, so what are we thinking about when we think about God?)
Thank you very much!