The Jesus scholar, Geza Vermes, lifts the lid on the term 'Son of God' and what it actually means rather than the stuff churned out by evangelical Trinitarian Christians.
Common knowledge: ‘Son of god’ is figurative not literal
It is common knowledge that before the New Testament, the Hebrew Bible and the Dead Sea Scrolls regularly speak of ‘Sons of God’ and occasionally refer to God in figurative speech as ‘begetting’ or ‘procreating’ a human being. 
‘Son of God’ used for ANY Jewish male who was pious
In the Bible and in writings produced during the centuries that followed the completion of the Old Testament, ‘Son of God’ occurs in a variety of meanings. In addition to the angels already discussed, among the humans ‘Son of God’ was the title of anyone believed in some way to be linked to God. Every male Israelite could pride himself on being a ‘son of God’, and reciprocally he was in a position to call God his Father. In the course of time the phrase was also applied – more and more restrictively – to the good Jews, to the especially holy Jews, culminating with the king of the Jews and finally with the Messiah, the most holy and powerful future ruler of Israel about whom we read in the Florilegium, one of the Dead Sea Scrolls, ‘I will be his Father and he shall be my Son. He is the Branch of David’ 
‘Son of God’ NEVER referred to a ‘man god’
Trinitarian Christians who promote Jesus to the status of God are found wanting with regards to the basic term ‘son of God’ as the scholar confirms the term does not refer to their idea of Jesus.
…It is universally agreed among experts that in Judaism the phrase [‘Son of God’] is always used metaphorically; it never designates a person who is believed to be simultaneously man and God, a human being who also shares in some way divine nature. 
 The Nativity, Geza Vermes, Penguin, 2006. p53 and 54
 Ibid. p54
 Ibid. p54
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