It is illogical to claim to be in the middle about the proposition of god or any proposition for that matter. You either think there is one(or many) or you think there isn't one(or many). Agnostic or gnostic is simply about whether you think the proposition is knowable or not.
Oh, and my wording wasn't the best. I meant intellectually honest, rather than intellectually viable.
Oh, and my wording wasn't the best. I meant intellectually honest, rather than intellectually viable.