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Truly, the religion with Allâh is Islâm. Those who were given the Scripture (Jews and Christians) did not differ except, out of mutual jealousy, after knowledge had come to them. And whoever disbelieves in the Ayât (proofs, evidences, verses, signs, revelations, etc.) of Allâh, then surely, Allâh is Swift in calling to account. (19)
So if they dispute with you (Muhammad SAW) say: "I have submitted myself to Allâh (in Islâm), and (so have) those who follow me." And say to those who were given the Scripture (Jews and Christians) and to those who are illiterates (Arab pagans): "Do you (also) submit yourselves (to Allâh in Islâm)?" If they do, they are rightly guided; but if they turn away, your duty is only to convey the Message; and Allâh is All-Seer of (His ) slaves (20)
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Quran: Chapter Al-E-Imran (3), Verses 19-20.