Education is also in the Forgotten Realms.
Problem is, it's your first-level feat.
Now, if one of the designers were to say that it was made to balance favored souls for some weird reasons (would they be too powerful with two epic spell slots at level 21?), I could accept that rational -- and find it lame nonetheless.
I mean, a favored soul would truly will be someone blessed, a prophet, who ears the teaching of his deity in his sleep or in visions. He would not read the "bible" of his church, he would be one of its writers instead.
It's like saying Moses knew nothing about Judaism, or that Mahomet could not have taught Islam.
So I'm thinking that, in fact, an automatic rank in Knowledge (religion) at each Favored Soul level would be a reasonnable class feature...