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.
English Transliteration
Ma kana ibraheemu yahoodiyyan wala nasraniyyan walakin kana haneefan musliman wama kana mina almushrikeena
Tafsir of Verse 67
No; Abraham in truth was not a Jew, neither a Christian; but he was a Muslim and one pure of faith; certainly he was never of the idolaters.
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.