Sincere question about Jewish view of Godhead/Trinity?

The holiest line in Judaism is essentially "Shema Yisrael, Adonai Eloheinu, Adonai Ekhad". Translated from the Hebrew, this is "O Hear, (people of)Israel, the Lord is your G-d, the Lord Alone!". So, needless to say, we're not fans of the trinity belief. There is one entity and that is G-d: Yahweh (translated between langauges into Jehovah) , Eloheinu, Elohim, and Adonai are just alternative names for the same thing according to us. There is no separation or distinction.

Jesus is obviously NOT seen as a Messiah or a divine figure according to us as well. Our concept of the Messiah even lacks notions of divinity, so he is often imagined to be a mortal man. At best, Jews believe Jesus was an educated Jew (perhaps a Rabbi) that wanted to reform the religion but did not want to change things theologically. So, while Jesus sounds like a good guy to me, he's nothing more than that.

Godhead and Trinity are Christian concepts. The Jews don't hold to either one.

It is my understanding that the Jews were leaning heavily towards monotheism after (or during) the Deuteronomic Reform, although they too once believed that God had a son. Asherah was also worshipped as the wife or consort of God. The brazen serpent, which represented the Son of God and the statue of Asherah were both kept in Solomon's Temple for hundreds of years. During the Deuteronomic Reform, both were removed and destroyed.

Judaism holds that perhaps Jesus was some sort of radical rabbi, but nothing more. We have no concept whatsoever of a trinity, nor of a "G-dhead".