I don't believe he would have to. The "Item Creation" section only says he must use UMD to emulate the spell, not that he must also emulate having a casting stat or whatever.
Besides, if the spell is Cleric 1, then it's also Favored Soul 1, and Favored Soul uses Charisma to cast. Or if your Arty prioritized Int over Cha, use the Archivist version.
Edit: to clarify, your Arty is not actually casting the spell, only emulating it. The normal rules for being able to cast a spell do not apply.