Abraham was neither a Jew nor a Christian, but he was one (3:67)

﴿مَا كَانَ إِبْرَاهِيمُ يَهُودِيًّا وَلَا نَصْرَانِيًّا وَلَٰكِن كَانَ حَنِيفًا مُّسْلِمًا وَمَا كَانَ مِنَ الْمُشْرِكِينَ﴾
[ آل عمران: 67]

3:67 Abraham was neither a Jew nor a Christian, but he was one inclining toward truth, a Muslim [submitting to Allah]. And he was not of the polytheists.

Abraham was not a Jew or Christian in belief, but he was opposed to all false religions and obedient to Allah alone.
He was also not one of those who ascribe partners to Allah – contrary to the idolaters of the Arabs, who claim to follow his belief.

Ibrahim (Abraham) was neither a Jew nor a Christian, but he was a true Muslim Hanifa (Islamic Monotheism - to worship none but Allah Alone) and he was not of Al-Mushrikun (See V. 2:105).

phonetic Transliteration

Ma kana ibraheemu yahoodiyyan wala nasraniyyan walakin kana haneefan musliman wama kana mina almushrikeena

Abdullah Yusuf Ali - Translation

Abraham was not a Jew nor yet a Christian; but he was true in Faith, and bowed his will to Allah's (Which is Islam), and he joined not gods with Allah.

Safi-ur-Rahman al-Mubarakpuri

Ibrahim was neither a Jew nor a Christian, but he was a true Muslim Hanifa and he was not of the Mushrikin

Page 58 English transliteration