Sorry Graham, mis-read your original post.
You could claim that God could be more than one thing. Very common in world religions, in fact.
The idea of God actually being the Higgs boson doesn't realy stand up though. Higgs boson being some kind of manifestation, or intrusion into our dimensions – that's another possibility. But equally, so could all matter.
But that's all theoretical. God really exists as an artefact of religions – that is unquestionable. Where the universe came from is something of a different debate. As is the true nature of reality. If we live in but three dimensions of many, then a hell of a lot of weird things are possible.