I have to admit - I don't think I understand your point, nor do I see why the people here who oppose the Sabbath should have an argument against your point.
The translations I am reading do not seem to require that the Gen 4:3 event be on a Sabbath - but they don't oppose it either given that a thank offering is allowed on Sabbath. However it looks like this is supposed to be a sin offering from the way Able's Sin offering is accepted but grain/harvest offering to Cain is not. Even so - sin offerings could be done on any day - including the Sabbath.
Genesis 4:3 — The New International Version (NIV)
3 In the course of time Cain brought some of the fruits of the soil as an offering to the Lord.
Genesis 4:3 — English Standard Version (ESV)
3 In the course of time Cain brought to the Lord an offering of the fruit of the ground,
Genesis 4:3 — King James Version (KJV 1900)
3 And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto the Lord.
Genesis 4:3 — The New King James Version (NKJV)
3 And in the process of time it came to pass that Cain brought an offering of the fruit of the ground to the Lord.
Genesis 4:3 — New Century Version (NCV)
3 Later, Cain brought some food from the ground as a gift to God.
Genesis 4:3 — American Standard Version (ASV)
3 And in process of time it came to pass, that Cain brought of the fruit of the ground an offering unto Jehovah.
Genesis 4:3 — 1890 Darby Bible (DARBY)
3 And in process of time it came to pass that Cain brought of the fruit of the ground an offering to Jehovah.
Genesis 4:3 — GOD’S WORD Translation (GW)
3 Later Cain brought some crops from the land as an offering to the Lord.
Genesis 4:3 — The Holman Christian Standard Bible (HCSB)
3 In the course of time Cain presented some of the land’s produce as an offering to the Lord.
Genesis 4:3 — The New Revised Standard Version (NRSV)
3 In the course of time Cain brought to the Lord an offering of the fruit of the ground,
Genesis 4:3 — The Lexham English Bible (LEB)
3 And in the course of time Cain brought an offering from the fruit of the ground to Yahweh,
Genesis 4:3 — New International Reader’s Version (1998) (NIrV)
3 After some time, Cain gathered some of the things he had grown. He brought them as an offering to the Lord.
Genesis 4:3 — New American Standard Bible: 1995 Update (NASB95)
3 So it came about in the course of time that Cain brought an offering to the Lord of the fruit of the ground.
-- here in the NLT they seem to argue for a thank offering, a grain offering ...
Genesis 4:3 — New Living Translation (NLT)
3 When it was t
ime for the harvest, Cain presented some of his crops as a gift to the Lord.
Ok but why would that be an issue unless there was a text that said that either a sin offering or a grain offering could only happen on a weekly Sabbath - and thereby making the reader suppose that this is a weekly Sabbath.
Certainly that is true - but it would be true no matter which day of the week it is in Gen 4:3 from what I am reading.
I agree - it is not saying "at the end of the world".
Are you saying they 'could be' doing that - or that the text specifically is speaking of Shabbat??
Agreed.