Notice that I said IF it is as he says. I have no idea how closely you have read various forum threads on dominion mechanics, but six temples and three blood sacrifices per turn may well not be enough. Starting dominion strength determines a lot of how fast a dominion spreads and the strength of dominion checks, and if he had a significantly higher starting dominion, that may be the cause.
Some of the dominion related issues are anything but straightforward. If you haven't done it yet, now is a good time to read the Bug Shortlist thread. Namely,
this post. There's a bright red bug entry there that is eminently relevant to this discussion.
So kindly do not jump to conclusions and spew flames before you have checked out all of the issues.