Jesus was the son of God. Jesus is the guy Jews don’t believe in.
Jesus IS GOD in human form. Son of God is a title that refers to the creation of the being and is NOT exclusive to Jesus. Angels are called the sons of God in the bible before Jesus is, Lucifer is called a son of God. Christians who are born again are said in the bible to be new Creations reborn spiritually and are now sons of God. Son of God refers to beings that are created spiritually rather than physically, not created from physical conception like two parents make a child but rather any creation direct from God. Even Adam the first man is called a son of God.
Jesus Christ is called the only BEGOTTEN son of God because just like a child begat by two parents is made up of part of both, a mix of the DNA that makes up both Jesus is a part of God that was made into the form of a Human, specifically the word of God, the biblical says that Gods word is a living thing and that word was made in flesh, was made in the form of a Human. Jesus Christ is every bit God as God the father, he is just part of the father, his word that was made flesh.