3:64 O People of the Book, why do you dispute about Abraham, when the Torah and the Gospel were not revealed till after him? Do you not understand?
65 Behold! You are they who disputed about that of which you had knowledge; why then do you dispute about that of which you have no knowledge? And Allah knows while you know not.
66 Abraham was not a Jew nor a Christian, but he was (an) upright (man), a Muslim; and he was not one of the polytheists.
67 The nearest of people to Abraham are surely those who follow him and this Prophet and those who believe. And Allah is the Friend of the believers.

6:162 Say: As for me, my Lord has guided me to the right path -- a right religion, the faith of Abraham, the upright one, and he was not of the polytheists.

22:78 And strive hard for Allah with due striving. He has chosen you and has not laid upon you any hardship in religion -- the faith of your father Abraham. He named you Muslims before and in this, that the Messenger may be a bearer of witness to you, and you may be bearers of witness to the people; so keep up prayer, and pay the poor-rate, and hold fast to Allah. He is your Protector -- excellent the Protector and excellent the Helper!

30:30 So set your face for religion, being upright, the nature made by Allah in which He has created men. There is no altering Allah's creation. That is the right religion -- but most people know not --
31 Turning to Him; and keep your duty to Him, and keep up prayer and be not of the polytheists,

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Now, without some of the "culture specific" terms...

3:64 O People of the Book, why do you dispute about Abraham, when the Torah and the Gospel were not revealed till after him? Do you not understand?
65 Behold! You are they who disputed about that of which you had knowledge; why then do you dispute about that of which you have no knowledge? And (the One True God) knows while you know not.
66 Abraham was not a Jew nor a Christian, but he was (an) upright (man), a (submitter to the One True God); and he was not one of the polytheists.
67 The nearest of people to Abraham are surely those who follow him and this Prophet and those who believe. And (the One True God) is the Friend of the believers.

6:162 Say: As for me, my Lord has guided me to the right path -- a right religion, the faith of Abraham, the upright one, and he was not of the polytheists.

22:78 And strive hard for (the One True God) with due striving. He has chosen you and has not laid upon you any hardship in religion -- the faith of your father Abraham. He named you (submitters to the One True God) before and in this, that the Messenger may be a bearer of witness to you, and you may be bearers of witness to the people; so keep up prayer, and pay the poor-rate, and hold fast to (the One True God). He is your Protector -- excellent the Protector and excellent the Helper!

30:30 So set your face for religion, being upright, the nature made by (the One True God) in which He has created men. There is no altering (the One True God's) creation. That is the right religion -- but most people know not --
31 Turning to Him; and keep your duty to Him, and keep up prayer and be not of the polytheists,

From these verses, we can see that although the TERM "ISLAM" may not have been used among the former prophets, the ESSENCE of what Islam IS has been in existence since the creation of man...and before.

RM