There is a claim out there that a lot of the odd things Stephen says in Acts 7 can be explained by him perhaps being a Samaritan or influenced by their traditions. While I found this idea interesting at first, I quickly came to realize that the specific pillars of the claim are faulty.
Stephen is Pro-David while the Samaritan Tradition is Anti-David. The way Stephen uses Psalm 132 even implies the location of David's Tabernacle not Solomon’s Temple is the true intended location of the Mishkan, not very compatible with the Samaritan Gerizim tradition. Stephen also quotes Prophets the Samaritan don’t recognize like Isaiah and Amos.
The Samaritan Pentateuch reflects the Samaritan Custom of saying Shehmaa (THe Name) instead of Adonai (The Lord) as stand in for the Tetragrammaton. Stephen in Acts 7 is definitely following the Jewish custom here, in verses 30-37, 49 and 59-60. Saying The Name did also become a custom in Rabbinic Judaism, but it seems to have developed later, I’m aware of no example of it in the First Century CE or BCE. The New Testament certainly never does it, the word name is only ever a descriptor never used as a Name or Title for God.
Some of the things alleged to be explained by textual differences between the Samaritan Pentateuch and the Masoretic Text, like saying 75 rather than 70 people went to Egypt, are just as easily explained by following the Septuagint which is what you’d expect from him being a leader in a Greek Speaking Jewish Community, but more than that so were his accusers which included Jews of Alexandria and Cyrene the specific communities most likely to be attached to the LXX. Stephen’s quote of Amos is another case of him using the LXX.
As an enemy of LXX primacy and the popular claim that the NT consistently uses it I consider Stephen in Acts 7 the one case where the Septuagint likely is the source material being used. I believe the overall message of Stpehen’s sermon is inspired by the Holy Spirit, but since he’s not an Apostle I wouldn't treat as infallible specific details unique to him or his choice of text.
Saying Terah died right before Abraham leaves Harran at 75 is not a conclusion you need the Samaritan Pentateuch to come to. In fact if you aren’t stopping to do the math then it is in all versions the natural conclusion since Genesis describes Terah dying and then Abraham being called out of Harran. Now sometimes Genesis does describe things like this out of order, especially when changing which generation is now the Main Character, so this alone isn’t proof Stephen was right on this matter but it does show you can jump to this assumption no matter which text you’re using.
The apparent contradiction caused by the math that only the SP lacks is easily resolved by remembering that Genesis 5:32 and 6:10 and 7:13 and 9:18 and 10:1 all list Noah’s sons as Shem, Ham and Japheth while the rest of Genesis 10 clearly treated Japheth as the oldest and explicitly says he is in verse 21. Sometimes the sons are named not in birth order but in an order that lists the one the overall Biblical Genealogy goes through first. So Abraham being listed first in Genesis 11:26-27 repeats that pattern, Nachor seems to be Terah’s first born since he and his descendants inherited Terah’s land in Harran.
It’s Acts 7:16 that really seems to a casual observer very Samaritan. Except that the Samaritan Pentateuch doesn’t actually disagree with the Masoretic text on either issue Stephen is alleged to be contradicting the Masoretic Text on. In the SP the first three Patriarchs are buried at Kirath-Arba aka Hebron and Jacob not Abraham bought a field near Shechem from Hamor/Emmor the father of Shechem/Sychem. We also say in verses 8-9 that Stephen used the term Patriarch primarily of Jacob’s sons, not Jacob and his ancestors. And verse 15 explicitly distinguished the fathers who died in Egypt he’s talking about from Jacob.
Stephen is not directly saying that Abraham, Isaac and Jacob were buried in Shechem, the intent to me is clearly to refer to people who died in Egypt and were at first laid to rest there until the Exodus. The actual Hebrew Bible Texts only directly refer to Joseph having his body moved and buried at Shechem on the land bought from Hamor in Joshua 24:32, but it's reasonable to infer others were with him.
Saying Abrahm bought the field from Emmor is not quite as easy to explain. It could be it was land Abraham intended to buy but it wasn’t carried out till Jacob. Like how Elisha fulfilled some missions first given to Elijah like anointing Jehu and Hazael. We do know that Abraham had spent time in the area of Shechem in Genesis 12:6 where he did build an Altar.
People just assumed off vibes that saying something unusual about Shechem sounds Samaritan. I do see some people word this as about Samaritan Traditions not the SP text itself, but whether or not such a tradition exists, it’s not the only way to come to Stephen’s conclusion. The Samaritan tradition is that all of Jacob’s sons were buried at Shechem, not just Joseph, no contradiction on where Abraham, Isaac and Jacob were buried. Stephen could be referring to that, or he could be referring to sons and grandsons of Joseph. The only Shechem based Samaritan disagreement about events involving Abraham is wanting the location of Isaac’s offering in Genesis 22 to be Moreh rather than Moriah, that too involved no textual difference it seems just interpreting them to be the same name, and is irrelevant to anything in Acts 7.
Stephen also doesn't have to be a Samaritan to see himself as a descendent of specifically the Joseph Tribes, Ephriam and Manesseh. I do believe the Samaritans descend from Ephraim and Manesseh into the gentiles settled in the region by the Assyrians as I talked about in a prior post. But they aren’t the only descendents of Ephraim and Manesseh, those who in 2 Chronicles 30 took part in Hezekiah’s Passover I believe became citizens of Judah and thus Jews.
Another appeal to Samaritan tradition is the idea that God first called Abraham when he was still in Ur Kassidim. Nothing in the actual Text of Genesis contradicts such a thing, I'm sure you can find plenty of purely Jewish fan fiction depicting God already calling Abraham at Ur Kassidim.