I believe in Oneness doctrine. I have taught it to many since 1980. But the version of it that teaches God had no visible image before Bethlehem is a stumbling block to us.
It is so clearly refuted by scripture.
No image before the incarnation?
Notice how he has a throne. He himself is on it. There are angelic Heavenly beings there.
18: Again he said, Therefore hear the word of the LORD; I saw the LORD sitting upon his throne, and all the host of heaven standing on his right hand and on his left.
19: And the LORD said, Who shall entice Ahab king of Israel, that he may go up and fall at Ramoth-gilead? And one spake saying after this manner, and another saying after that manner.
20: Then there came out a spirit, and stood before the LORD, and said, I will entice him. And the LORD said unto him, Wherewith?
21: And he said, I will go out, and be a lying spirit in the mouth of all his prophets. And the LORD said, Thou shalt entice him, and thou shalt also prevail: go out, and do even so.
2 Chronicles 18:18-21
As God has an image in the New Testament so he had one in the Old.
At the incarnation that image was changed from spirit to flesh. Its that simple.