It wasn't actually a Talmudic doctrine. It was held by the Israelites all the way back into the first temple period. But I agree, we can set it aside.

And I agree. The primary message of the Bible does not depend on Trinitarian doctrines. However I do believe it to be important for deeper understanding of our creator. But we will have all of eternity to get to know Him better and I guarantee we will all be wrong about something and will learn better when we see Him face to face.