No, he is definitely not talking about any religions god, so you are definitely correct there. He merely states he believes in some creator, but does not claim to know his nature or origin.
Which is basically my view on the subject. If the theory works for the smartest man on earth, it works for me too.
If you put a gun to my head and forced me to describe the nature of God, my GUESS would be that God and Mother nature are one in the same. Simply put, God is the rulebook that governs the physical universe(s).