Yeah, that is precisely what I am concerned with, since, as said prior, this has the potential to mutilate quite a bit of verses if applied. Furthermore, there is also the question of exactly which part we don't want the verse to be "accurate" to. Would a verse acknowledging God as the Holy Trinity mean its "God" character is now disqualified from being indexable, for instance? What aspect of the IRL figure is a verse not allowed to cover without getting the axe?
Of course, given the primary concern here is "It's the same thing as tiering the actual religion!", I'll rip off the band-aid and cut down to the logical conclusion of that line of thinking: What we wouldn't want the verse to be accurate to is the metaphysics underpinning the tier of the God character. This leaves us with an interesting scenario: Religion and theology are linked to the metaphysics, but the metaphysics themselves are wholly separable from religion and theology, which means that those same attributes that make the fictional "God" a certain tier can also be found in characters that have little to do with actual religion.
An example that I often like to use is probably the following: It is affirmed by any classical theist that God is above space, and furthermore that God is above time. These are the attributes of Immensity and Eternity. Obviously, though, in fiction you will find
a great deal of characters who are above space and time. Are we to just, refuse to tier these characters, then? Under the accusation that, when we do so, we are technically tiering an attribute of God.
An objection that may be raised is "These attributes are fine to be tiered when they're attached to characters who don't correspond to any particular religious figure." Yet the cries of controversy largely boil down to "This will upset people," as Grath pointed out up there. So even if the character is not "Religious figure + Metaphysical attribute," but instead is "Wholly fictional being + Metaphysical attribute," it could still be called problematic, insofar as people can feasibly just make the connection in their heads and complain anyway.
So, as far as I see, this whole line of thinking leads to a pretty slippery slope where we just... refuse to tier or index any metaphysical thing whatsoever, because all metaphysics has been incorporated into some religion, in some way, shape or form. And frankly this is just an utter mutilation of the wiki.