It's actually Suwako telling Byakuren to cast away her belief if she wants to love Kanako. Since Kanako is a god, she has to worship her. Solution? Make Kanako her pet.
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AHA!Kana-chan...Kana-chan...Hijiri-chan.Hey...HA!HAHAHAHA!!AHAHAHA!!Kanako is a god. There's that thing to do when loving a god like that.AHA!Throw away all your beliefs and those who believe in you.There is one thing.One method to make everyone happy.You're all alone. You can't exist without loving Kanako.