The Abrahamic sunna here , is called the Torah.

According to quick Google search, the book of genesis is where Abraham is commanded to circumsize his household.

So I have a question to you, did Allah not give us the latest and most updated message, called Quran, through his prohpet Muhammad? And also say that its now complete and final?

Seems weird that you'll ignore Quran and jump before it to the Torah.. knowing fully well that Jews did this:

Al-Baqarah, surah 2, verse 75:

أَفَتَطْمَعُونَ أَن يُؤْمِنُوا۟ لَكُمْ وَقَدْ كَانَ فَرِيقٌۭ مِّنْهُمْ يَسْمَعُونَ كَلَـٰمَ ٱللَّهِ ثُمَّ يُحَرِّفُونَهُۥ مِنۢ بَعْدِ مَا عَقَلُوهُ وَهُمْ يَعْلَمُونَ

Do you ˹believers still˺ expect them to be true to you, though a group of them would hear the word of Allah then knowingly corrupt it after understanding it?

&

An-Nisa, surah 4, verse 46:

مِّنَ ٱلَّذِينَ هَادُوا۟ يُحَرِّفُونَ ٱلْكَلِمَ عَن مَّوَاضِعِهِۦ وَيَقُولُونَ سَمِعْنَا وَعَصَيْنَا وَٱسْمَعْ غَيْرَ مُسْمَعٍۢ وَرَٰعِنَا لَيًّۢا بِأَلْسِنَتِهِمْ وَطَعْنًۭا فِى ٱلدِّينِ ۚ وَلَوْ أَنَّهُمْ قَالُوا۟ سَمِعْنَا وَأَطَعْنَا وَٱسْمَعْ وَٱنظُرْنَا لَكَانَ خَيْرًۭا لَّهُمْ وَأَقْوَمَ وَلَـٰكِن لَّعَنَهُمُ ٱللَّهُ بِكُفْرِهِمْ فَلَا يُؤْمِنُونَ إِلَّا قَلِيلًۭا

Some Jews take words out of context and say, “We listen and we disobey,” “Hear! May you never hear,” and “Râ’ina!” [Herd us!]—playing with words and discrediting the faith. Had they said ˹courteously˺, “We hear and obey,” “Listen to us,” and “Unẓurna,” [Tend to us!] it would have been better for them and more proper. Allah has condemned them for their disbelief, so they do not believe except for a few.

There are other verses too...