Working backwards.

[Aoi Magi]

Nope, before you get into the guidance bit, theres the part about defining the creator from whom the guidance is coming. And the confirmation bias starts right from there. Going by what you are calling the "reverse approach", one has to first choose the best description of god that matches their own imagination, before examining the proofs being presented.

Not true. You can just eliminate religions you know are very irrational.  And keep studying religions that you see as possible.

That's the thing, every single religion presented so far fall in the "very irrational" category after examining their claims.

Yes some philosophical religions like buddhism and certain sects of hinduism do have their saving graces cause they provide philosophical explanation attempts and not bold claims, but they too have failed when it comes to the claims about divine wisdom or anything supernatural.

The thing that you fail to realize is that atheists have been examining the claims of various religions since the first time religion raised it's head. Skeptics have always been there, even in the animal community outside of you humans. There are no known religions which "could be possible" so far. If you know of any such religion, do ask the creator to present it's case.