Ishaaq (Isaac) and Yaqub (Jacob) (PBUT) - The Prophets' Last Wish
Allah the Almighty declared in the Glorious Quran: And who turns away from the religion of Abraham (i.e. Islamic Monotheism) except him who befools himself? Truly. We chose him in this world and verily, in the Hereafter he will be among the righteous.
When his Lord said to him: "Submit (i.e. be a Muslim)!" He said: "I have submitted myself (as a Muslim) to the Lord of the 'Alamin (mankind, jinn and all that exists)."
And this (submission to Allah, Islam) was enjoined by Abraham upon his sons and by Jacob, (saying): "0 my sons! Allah has chosen for you the (true) religion, then die not except in the Faith of Islam (as Muslims - Islamic Monotheism)."
Or were you witnesses when death approached Jacob? When he said unto his sons: "What will you worship after me?" They said: "We shall worship you Ilah (God - Allah) the Ilah (God) of your fathers, Abraham, Ishmael, Isaac, One Ilah (God), and to Him we submit (in Islam)."
That was a nation who has passed away. They shall receive the reward of what they earned and you of what you earn. And you will not be asked of what they used to do.

Ishaaq (Isaac) and Yaqub (Jacob) (PBUT) - Qur'an's Way of Confronting People of the Book
And they say: "Be Jews or Christians, then you will be guided." Say (to them, 0 Muhammad): "Nay, (we follow) only the religion of Abraham, Hanifan Islamic Monotheism, i.e. to worship none but Allah (Alone), and he was not of AlMushrikeen (those who worshiped others along with Allah.)"
Say (0 Muslims): "We believe in Allah and that which has been sent down to us and that which has been sent down to Abraham, Ishmael, Isaac, Jacob, and to Al-Asbat (the twelve sons of Jacob), and that which has been given to Moses and Jesus, and that which has been given to the Prophets from their Lord. We make no distinction between any of them, and to Him we have submitted (in Islam)."
So if they believe in the like of that which you believe, then they are rightly guided, but if they turn away, then they are only in opposition. So Allah will suffice you against them. And he is the All-Hearer, the All-Knower.
Our Sibghah (religion) is the Sibghah (religion) of Allah (Islam) and which Sibghah (religion) can be better than Allah's. And we are His worshippers.