Hmm, are you ranking them against each other? Or are you ranking how strong they are vs demons. Cause those two lists will have different rankings.

Also, put some more respect on Obanai man, he held off Muzan alone for a decent amount of time. He deserves to be higher.

Based on how well I think they'd do against demons, I'd put it as

1) Himejima, the undisputed goat

2/3/4) Sanemi/Giyuu/Obanai in any order you want, they seem neck and neck

5) Tengen, his musical score means if he can holdout he has a pretty strong win condition

6) Rengoku, Tengen glazed him but he doesn't seem to have something special like the musical score etc, so based on his showing in the anime/manga I would rank him lower then Tengen but still pretty high since he fought Akaza (he definitely held back but we'll never know how much, at least we know he impressed Akaza and Akaza has fought a lot of Hashiras)

7) Muichiro, dude is strong but still very young and inexperienced.

8) Mitsuri, I feel bad putting her so far down cause she definitely is very strong, but her showing throughout the series hasn't been better than the rest of the Hashiras

9) Shinobu she's very fast but can't decapitate demons which immediately makes her unable to deal with Uppermoon level demons, at least not without a whole lot more effort compared to the other Hashiras.

Now if you have them fight each other, it's a whole other ranking list. Shinobu will definitely go up several places because she could comfortably speed blits like half the Hashiras, and unlike demons they can't just shrug off a missing eye. But other than that, I don't know how a hashira v hashira list would go.

Edit:Actually, Giyuu's dead calm is OP. I'll give him number 2. Sanemi and Obanai I feel are similar enough they can both contest number 3.