True, but not a counter-argument. I never claimed that Christ was his name, so I'm not sure why you mentioned that. If you want some more irrelevant details, Christ wasn't his title either - it's an Anglicised transliteration of the Greek title.
The detail of whether Jesus founded Christianity as a spin-off from Judaism or the more detailed statement that he founded a form of Judaism that became a spin-off from Judaism that became Christianity is irrelevant to whether or not he believed in the god that's common to Judaism and Christianity, which was the point in question.