Also; I'm not so sure anymore that Yasu is a messenger of "HOPE". Wouldn't this line contradict that idea, as, for as far as we know, he is the oldest "god"?
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Not exactly, it's possible that HOPE is actually the youngest. Although the Ball of Light is assumed to be the first, the Second god, can also be assumed to be the first apparently:
Then there's the third god which is mostly unknown, but could even be the "first" since nothing is really known about it. It's all mostly meant to be hearsay.
There's also how Nozomu/Hope apparently died, yet is still alive somehow. Based off Yasu's church being known as the Church of New Hope, it could be that HOPE is a New version of Nozomu. A younger version of an older god.
There's also maybe even 9 gods now, if we take the 'From the desk of the Ninth god' thing literally. The first 3 also may have been one god, which would make that one god older than the 3 we know. So, the older gods could actually be far older than the 3 gods we know.
Overall: It's overcomplicated and might be all bullshit, anyway. The Narrator/Narrators could have simply been lying to us about the gods. Of course, Yasu could also have been lied to. Or everyone is lying: