Kaku has never rejected the notion of God, but he has (albeit while popularizing futurology and not of his own personal goals) suggested that humanity might one day effectively become God by escaping the heat death of our universe. The final Great Filter is entropy, it seems.
I hope to meet every one of you in Heaven
Grayson Clark
Michael Campbell
Repent your degenerate heresy
Gavin Parker
Well, it sounds like what he's really saying then is that the only way to escape the Heat Death of the universe is to literally become God.
Easton Scott
That might be what he means, yes.