As I understand it, if you concentrate your magic, you aren't limiting yourself to just that one *god*--you're limiting yourself to just that one *world*. If you concentrate on Theistic magic, you can use feats and affinities from any god, including common magic feats--but you can't use spirits, spells, etc. from any school. Mind you, your *god* may object if you mix feats from different gods (if, say, a Chalana Arroy initiate starts learning "Sword" or "Headhunter" feats), but the rules won't.
There are exceptions--e.g. a Lunar can "concentrate" in the Lunar pantheon, and thus use any Lunar spells/feats/spirits, but no non-Lunar magic from any world. (I suspect Trolls do something similar, concentrating in just Underworld or just Circle-of-Eight, but this hasn't been worked out.) But by and large, concentrating your magic doesn't limit you to a specific god or even a specific pantheon.
As I understand it, anyway...
--AMS
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