I remember seeing somewhere, but I'm not sure where I remembered seeing it, where children who are raised as clerics are trained in the use of their deities favored weapon.
Does anyone else remember anything like this from anywhere? If so, where?
From the 3.5 SRD in the class description for the Cleric:
Which means that normally, Clerics are proficient with simple weapons only. But a Cleric who chooses the War domain becomes proficient in the deity's favored weapon.
A Cleric without the War domain does not gain that proficiency.
I house rule that Clerics can use their deity's favored weapon. It isn't like they are getting free weapon focus unless they take the war domain. You have much more power issues from Clerics using Righteous Might, Divine Metamagic, and Miracle then whether or not they are using a Quarterstaff, a Mace, a Longbow, or a Longsword.