Quran 3:19 — The Amramites (Ali-'Imran)

The only religion approved by GOD is "Submission." Ironically, those who have received the scripture are the ones who dispute this fact, despite the knowledge they have received, due to jealousy. For such rejectors of GOD's revelations, GOD is most strict in reckoning.

[3:18] GOD bears witness that there is no god except He, and so do the angels and those who possess knowledge. Truthfully and equitably, He is the absolute god; there is no god but He, the Almighty, Most Wise.

[3:20] If they argue with you, then say, "I have simply submitted myself to GOD; I and those who follow me." You shall proclaim to those who received the scripture, as well as those who did not, "Would you submit?" If they submit, then they have been guided, but if they turn away, your sole mission is to deliver this message. GOD is Seer of all people.