Ethan already knew about the existence of the Gods; however, according to his understanding, they couldn't watch the worlds they didn't own.
That's right.
This world was not owned by any God; otherwise, he would not have survived this long while carrying a Supreme Godly Artifact—the Godly Revival System.
The reason why the Bloodclaw Tribe was able to receive the blessings of the Blood God was because of the Blood Scrolls containing the Blood God's Power.
As for how those Blood Scrolls appeared in this world, initially, Ethan had no confirmed idea about it.
But he knew one thing for sure, and it was not impossible for Gods to spread their scrolls across worlds they did not own.
Earlier, after reviving Leoric in the Azure Serpent Realm and learning about the Azure Serpent God's Apostle, Ethan formed a clearer guess.
Just like how the Azure Serpent God had sent his Apostle to turn Leoric into a Cursed Apostle, the Blood God must have done the same.
