Christianity and Islam - As Abrahamic Religions

As Abrahamic Religions

Christianity, Islam and Judaism are known as Abrahamic religions because of their common origin through Abraham. Muslims consider Ishmael (Ismā'īl), the first born son of Abraham, to be the "Father of the Arabs" and Abraham's second son, Isaac (Isḥāq), is called "Father of the Hebrews". The story of Abraham and his sons is told in the Book of Genesis and the Qur'an but with certain differences.

Muslims commonly refer to Christians and Jews as "People of the Book", people who follow the same general teachings in relation to the worship of the One God (Tawhid) as known by Abraham.

The Catechism of the Catholic Church, the official doctrine document released by the Roman Catholic Church, has this to say regarding Muslims:

The Church's relationship with the Muslims. "The plan of salvation also includes those who acknowledge the Creator, in the first place amongst whom are the Muslims; these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind's judge on the last day." —Catechism of the Catholic Church

The Qur'an explicitly promises salvation for all those righteous Christians who were there before the arrival of Muhammad:

"Indeed, those who believed and those who were Jews or Christians or Sabeans - those who believed in Allah and the Last Day and did righteousness - will have their reward with their Lord, and no fear will there be concerning them, nor will they grieve" —Qur'an, Sura 2 (Al-Baqara), ayat 62

The Qur'an also makes it clear that the Christians will be nearest in love to those who follow the Qur'an and praises Christians for being humble and wise:

"You will find the closest in affection to those who believe are those who say: “We are Christians”; that is because among them are men devoted to learning and men who have renounced the world, and they are not arrogant.And if they hear what was sent down to the messenger you see their eyes flooding with tears, for what they have known as the truth, they say: “Our Lord, we believe, so record us with the witnesses.”
“And why should we not believe in God and what has come to us of the truth? And we yearn that our Lord admits us with the righteous people.”
So God recompensed them for what they have said with estates with rivers flowing beneath them, abiding therein; such is the recompense of the good doers." —Qur'an, Sura 5 (Al-Ma'ida), ayat 80-84