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Sisters call to the Emperor who exists in the warp, or their ideal of him, and because of their strong faith and pleas he answers to them.
That is my understanding at least
I have thought of it as being a sort of psycho-somatic kind of thing. They believe so sincerely in divine intervention for their purpose that they unconsciously push themselves to higher levels of performance. It's also possible that even though they're not psykers their 'faith' and perception of the emperor's presence is manifest in an awareness of and ability to draw on the astronomicon. (just making crap up here, but it sounds good!)
I always assumed it was because if they didn't, the Sisters would suck :-o
The only real Sisters fluff I've seen is "Faith & Fire", and as far as I recall there were no Acts Of Faith in there.
And over there we have the labyrinth guards.
One always lies, one always tells the truth, and one stabs people who ask tricky questions.