In the name of Allah, Most Gracious, Most Merciful

"Invite (all) to the Way of thy Lord with wisdom and beautiful preaching; and argue with them in ways that are best and most gracious: for thy Lord knoweth best, who have strayed from His Path, and who receive guidance." [Holy Qur'an 16:125]

Say: "O people of the Book (Jews and Christians)! come to common terms as between us and you: that we worship none but Allah; that we associate no partners with Him; that we erect not from among ourselves, Lords and patrons other than Allah." If then they turn back, say: "Bear witness that we (at least) are Muslims (bowing to Allah's will)." [Holy Qur'an 3:64]