WHAT DO CONSPIRACISTS SAY TO EXPLAIN A DIVINE HOLY SPIRIT?

Question: I can see the reasoning that conspiracists use to say “Jesus was never considered divine until the Romans manipulated/coopted the Christian movement and made Jesus into God”.

But what rationale do they give for adding the Holy Spirit in to make a Trinity? It doesn’t seem necessary and if it was back-edited into the New Testament, not nearly as much effort seems to have been made to prooftext for the Holy Spirit’s divinity.

Feels like a major weakness and oversight of the conspiracy theory to me.