Except the Hebrews didn't believe that God created the world out of nothing. The best example you have of that supposedly being mainstream Hebrew thought is a single verse in 2 Maccabees (7:28), which is believed to have been written around 150-100 BC. That is hardly "ancient and modern orthodox Judaism" as the book is not part of Jewish canon. You can look at the Hebrew word used in Genesis 1:1 that is translated as "created" in English is "bara", which is not contextually used to mean "creation from nothing". You can also look at the Greek of 2 Peter 3:5 and see direct support for "creatio ex materia". Some might interpret the English "earth" as only meaning "dry land", but that wouldn't work given the context of the preceding verses.
We could potentially take it even further and explore the idea that "creatio ex nihilo" implies that God himself is nothing. God creating all things would mean that all things are the product of the mind of God. If God (and therefore his mind) is eternal and he created all things, that would mean that his mind would be the pre-existing material by which all things were given form.
As for "God not being a man", that is also difficult to substantiate given that God created man in his image. "God the Son" becoming a man likewise contradicts the notion that God is unchanging (in the terms of how Nicaeans present the term "unchanging"), uncreated, etc., as God upon becoming incarnate in flesh would be undergoing an objective change. This would directly mean that "God the Son" is created, as God the Son's existence is predicated upon incarnation in flesh and since you deny that God the Father has a physical body, that means that the body was created at a later time.
It then runs into LDS theology of God the Father having a physical body. Your theology denies this, yet contradicts itself in the very idea of "God the Son" being "God incarnated in flesh". Either you acknowledge that God the Father always had a physical body, or that the idea of consubstantiality doesn't work due to attributing different natures to one aspect of the Nicene God and not the other.
There are other issues as well. If "God the Son" is "God becoming man", you would at minimum be agreeing to the idea of God being an "exalted man" upon Jesus' Transfiguration. The hypostatic union suggests this too.