I don't know. The White God is pretty popular. One of the most popular gods on earth...lots and lots of worshipers, which would make him pretty powerful. I would say he's probably affected by worship the same as any other god.
Well, Harry does get a glimpse/vision of just how powerful a particular angel is.
Now, maybe Harry was misunderstanding / misjudging... I mean, the guy HAS been known to make a mistake (or two), on rare occasions!
Maybe Harry was actively deceived by the angel, who wanted Harry to think he was that powerful... Harry has ALSO been tricked a time or two (including mind-to-mind, like this)!
The thing we know BEST about Harry is that he's an "unreliable reporter." So maybe we just ignore everything Harry thinks, does, says...
Or not, 'cos then all-things-Dresden are just each of us solo-wanking over our own personal fantasy of how-kewl-is-Harry and/or how-skrewed-is-Harry and/or etc etc etc.
SPOILER WARNING (in case you don't recognize the (pretty old) parts I'm referencing from above):
So if we take ANY of the Dresdenverse at face value, we IMHO need good reason when we set aside any piece of it; not that we never do so, but we only do so with good reason. Personally, I don't yet see the reason to set aside his experiences with God's Chief Spook as erroneous.
And if Harry is even CLOSE to being right, then God's Chief Spook wields enough personal power to make every other power we've met look like inconsequential window-dressing... And we don't really know how tough the REALLY tough angels are... let alone their boss!