A captain with a doomfire ring is not a wizard but he casts bound spells exactly the same as a priest.
Except where "remains in play" bound spells are concerned. :p The arch lector is not a wizard until he tries to cast 2 RiP bound spells, then according to our FaQ, he is one and follows the rules for RiP spellcasting.
This is the reason why I'm not so sure anymore. The arch lector apparently follows the rules for wizards in some ways, but not others, and it's a very "pick n' mix" process at the moment!
If the captain had both the doomfire ring and ring of volans (I know, you can't take both...) then people would allow him to cast the doomfire ring after using a "remains in play" wall of fire from the ring of volans.
The arch lector is in the same position, having access to 2 bound spells, yet according to the FaQ he does not follow the same rules that a captain would if he had 2 bound spells. Therefore he must be a spellcaster, because (at least when casting spells), he is using rules that apply to spellcasters and not ordinary characters.
Hate to be the one throwing the curveball here, but that FaQ ruling makes things a little less black-and-white. The BRB defines a wizard as "a model able to cast spells", it mentions absolutely nothing about requiring "wizard" or "magic" to be present in the profile of the character, so I'm not sure why queek mentioned that.
And since the arch lector now apparently follows the rules for spellcasters, things aren't as clear. The arch lector is the source of his own prayers, he is the one casting them, and now, according to the FaQ they follow the rules for casting spells and not the rules for casting bound spells.
Ergo, the warrior priest is "able to cast spells", and according to the BRB definition, is a Wizard. Perhaps. It's not entirely clear.
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Note - I would never consider putting scrolls on my own priests, the words above are simply an analysis of the current rules rather than being any sort of representation of my actual intent. I am not a cheesey gnoblar.