we dont have to believe every single thing that every single Saint says. but in the instances of evolution and marriage and others, when you start to see Father after Father after Father after Father saying the same thing, you start to see the mind of the Church emerging. one or two Fathers saying something that no one else says, or that is contradicted by other Fathers is different than these subjects on which there is much harmony.
I want to follow through with this because this is an interesting way of interpreting things of the Scriptures. I know I mentioned this elsewhere but let me ask you seriously. If I was a Christian living in the 3rd Century, and I researched "Father after Father after Father" concerning the interpretation of the Nephilim, I would seem to believe that angels can have intercourse with women:
Tertullian (2nd Century) http://www.ccel.org/ccel/schaff/anf06.v.v.ii.html
St. Irenaeus (2nd Century) http://www.ccel.org/ccel/schaff/anf01.ix.vi.xxxvii.html#ix.vi.xxxvii-p19.2http://www.ccel.org/ccel/schaff/anf01.ix.vi.xvii.html#ix.vi.xvii-p12.1
St. Justin Martyr (2nd Century) http://www.ccel.org/ccel/schaff/anf01.viii.iii.v.html
Athenagorus (2nd Century) http://www.ccel.org/ccel/schaff/anf02.v.ii.xxiv.html#v.ii.xxiv-p4.1
St. Clement of Alexandria (2nd to 3rd Century) http://www.ccel.org/ccel/schaff/anf02.vi.iii.iii.ii.html#vi.iii.iii.ii-p37.1
Archelaus (3rd Century) http://www.ccel.org/ccel/schaff/anf06.vii.iii.xxxi.html
Lactantius (3rd to 4th Century) http://www.ccel.org/ccel/schaff/anf07.iii.ii.viii.xxiii.html
St. Methodius (3rd to 4th Century) http://www.ccel.org/ccel/schaff/anf06.xi.v.iii.i.html
Nemesius of Emesa (4th Century) (ACCS Genesis 1-11, pp. 123-4)
I've read elswhere that Eusebius of Caesarea (3rd to 4th Century), St. Hilary of Poiters (4th Century), St. Ambrose (4th Century), St. Jerome (4th to 5th Century), and Sulpitius Severus (4th to 5th Century) also believed that the Nephilim were sons of angels.
The following Church fathers also seemed to have allowed the idea that the Sons of God were angels, but were open to other interpretations:
Julius Africanus (2nd to 3rd Century) allows for either Sons of God or angels of men:http://www.ccel.org/ccel/schaff/anf06.v.v.ii.html
Origen--if taken literally, it's angels, but this is an allegory to teach a lesson (3rd Century)http://www.ccel.org/ccel/schaff/anf04.vi.ix.v.lv.html#vi.ix.v.lv-p3.1
Alexander of Lycopolis, same interpretation as Origen, and even calls this a "fable" (5th Century)http://www.ccel.org/ccel/schaff/anf06.viii.iii.xxv.html
I understand that these were the Church fathers used to support the idea that the Nephilim were sons of Seth:
St. Ephraim (4th Century)
St. Cyril of Jerusalem (4th Century)
St. John Chrysostom (4th Century)
St. Augustine (4th to 5th Century)
St. John Cassian (5th Century)
Fr. Seraphim mentioned St. Athanasius (4th Century), St. Cyril (5th Century), St. Gregory Palamas (14th Century)
If you noticed a pattern, "the mind of the Church" so to speak believed that the Nephilim were sons of angels up until around the late 4th, early 5th Century, where "the Church mind" seemed to reject that notion.
So I simply wonder why exactly did the Church seem to "change her mind" later?