User blog comment:FTWinchester/Season 9 concepts/@comment-198.22.122.159-20140107180007/@comment-5619706-20140112150450

The power of deities could be jacked up this season due to the Abrahamic pantheon falling into disarray--God missing in action, and Heaven being cleared of its occupants, and all but one angel having their wings clipped and powers weakened. In line with Lucifer's lines "I never understood you pagans, always fighting, always happy to sell out your own kind. No wonder you forfeited this planet to us."

That's basically what's happening to the Abrahamic faiths right now (actually the infighting and continued decline of Heaven started since Season 6 and had serious roots as early as Season 4--the Abrahamic God is still the strongest, but that doesn't mean that the pagan deities have to remain so weak, they could at least start to match angels in power, or even slightly overpower celestials at this point), which could be exploited by the writers this season. But since it sounds so perfect and makes total sense, they probably wouldn't.