Abraham was neither Jewish, nor Christian; he was a monotheist submitter. He never was an idol worshiper.
ما كانَ إِبرٰهيمُ يَهودِيًّا وَلا نَصرانِيًّا وَلٰكِن كانَ حَنيفًا مُسلِمًا وَما كانَ مِنَ المُشرِكينَ
maa kaana Ibraaheemu Yahoodiyyanw wa laa Nasraa niyyanw wa laakin kaana Haneefam Muslimanw wa maa kaana minal mushrikeen