I have a piece about Jesus as Son of God in
http://historical-jesus.info/hjes3x.html then "find" on
Jesus as the "Son" (of God)
Here it is in the raw (but better presented on my website):
B) Jesus as the "Son" (of God) or having God as his Father appears mainly in Paul's last (authentic) letters (2cCorinthians, Galatians, cPhilippians & Romans, written late 56 to early 57):
2cCo1:3,19,31, Gal1:16,2:20,4:4,6, Ro1:3,4,9,5:10,8:3,29,31,15:6 (altogether fifteen times, within about 11650 words).
Jesus as "Son" or having God as his Father is featured only a few times in Paul's early letters (1Thessalonians, 1Corinthians, 2a&bCorinthians, 2a&bPhilippians & Philemon, written 50 to 56):
1Th1:10, 1Co1:9,15:28 (altogether three times, within about 12430 words)
Remark: as a net result, there are about five times more frequency of occurrences of Jesus, as the "Son" (of God) or having God as his Father, in the later epistles as compared to the earlier ones.
Also, 1Th1:10, 1Co1:4-9 and 1Co15:23-28 are very likely latter interpolations (for justifications, please click on 1Th1:10, 1Co1:4-9 and 1Co15:23-28).
I want to stress the authenticity of the aforementioned passages is contested for many suspicious items, not only because of "Son". And let's say, in '1Thessalonians' and '1Corinthians', Paul was unlikely to mention Jesus as "the Son", because he wrote:
"God the Father and the Lord Jesus Christ" (1Th1:1)
"our God and Father" (1Th1:3)
"our God and Father himself and our Lord Jesus" (1Th3:11)
"... our God and Father, at the coming of our Lord Jesus ..." (1Th3:13)
"Grace to you and peace from God our Father and the Lord Jesus Christ." (1Co1:3)
"For even if there are so-called gods, whether in heaven or on earth (as indeed there are many gods and many lords, [for Paul, as it seems here, "lords" are not "gods"]
` yet for us there is one God, the Father ... and one Lord Jesus Christ ..." (1Co8:5-6a)
"the heavenly man [Jesus]" (1Co15:48,49)
Paul was reluctant to approve Jesus as the "Son of God". That did not come from Paul; but because of its acceptance among Gentile Christians, he had to adopt it later on. And in his letters to the Corinthians, Paul made the (clever) transition
TO: 2Co1:19a "For the Son of God, Jesus Christ ..."
FROM: 1Co1:3 "Grace and peace to you from God our Father and the Lord Jesus Christ."
as follows: 2Co1:3a "... the God and Father of our Lord Jesus Christ ..."
Eleven occurrences of Jesus as "Son (of God)" are in 'Hebrews' but there is nothing in Paul's letters about an explanation/basis for Jesus as the pre-existent "Son of God" (but it is in 'Hebrews'!).
Cordially, Bernard