The Family Of Imran - 3:67
Abraham was neither a Jew nor a Christian; he was a monotheistic Muslim. He was never of those who associate partners.
Prophet Abraham was a monotheistic Muslim, not one of those who associate partners:
The Cow/2:135
"They said: "Become Jews or Christians so that you may be guided". Say: "No, we follow the monotheistic religion of Abraham. He was not of those who associate partners."
The Bee/16:120
Abraham was a monotheistic pioneer, submissive to Allah. He never associated partners.
The Family Of Imran/3:95
"Say: "Allah speaks the truth; follow the monotheistic religion of Abraham. He was not of those who associate partners."
The Cattle/6:161
"Say: "My Lord has guided me to the straight path: the perfect religion of Abraham, the monotheist. He was not of those who associate partners."
The Bee/16:123
Indeed, We revealed to you to follow the religion of Abraham as a monotheist; he was never of those who associate partners.