It is a must to discuss with any person who we think is on the wrong path, Jews and Christians included. Discuss, not argue, not fight or think we know best unless we know best, and this comes from only the Qur'an and not the Bukharian fairy-tales.
5:44 We did send down the Torah containing guidance and a light. By it the Prophets who always sincerely submitted to God, judged the Jews.And the rabbis and the priests judged according to God’s scripture as they were commanded to observe. To them was entrusted the protection of God’s Book, and they were witnesses to it. So, fear not people, but fear Me and do not trade away My revelations for petty gains. Whoever does not judge and does not rule according to what God has revealed,
such are the disbelievers.
5:45 For them (Jews), We had decreed in the Torah: Life for life, eye for eye, nose for nose, ear for ear, tooth for tooth, and equal injury for injury (Exodus 21:23). But If one shall forgo retaliation by way of charity, it shall absolve his or her imperfections. Whoever does not judge or rule according to what God has Revealed, such are the wrongdoers.” [See 5:41. That was a time-bound Mosaic law specific to the Israelites. The Final revelation of God, the Qur’an has updated laws for all humanity for all Times. Incidentally, Exodus in the Bible, as seen today, does not leave room for forgiveness on the subject]
5:46 And after them We caused Jesus, son of Mary, to follow in their footsteps, confirming the (remaining truth in) what was revealed before him. We gave him the Gospel in which there was guidance and a light, and it confirmed the (truth in) what was revealed before it in the Torah, a guidance and admonition to those who wished to live upright. [2:101, 3:78]
5:47 Let the People of the Gospel judge by what God has revealed therein. Those who fail to judge and rule according to God's revelation, are drifters from the right path.
5:48 (O Messenger) We have sent to you this Divine Writ, setting forth the truth. It confirms the remaining truth in the earlier scriptures since it is a Watcher over them. So, judge between them by what God has revealed, and do not follow their desires diverging from the truth that has come to you. For each community among you We have appointed certain rites and a traced-out way. If God had willed, He could have made you all one single community. But He decided to let you test yourselves by what (potentials) He has granted you. So, outdo one another in doing good to the society. To God you will all return, and He will then make you understand wherein you differed. [2:101, 2:148, 3:78, 21:92-93, 23:52. Muhaimin = Watcher. Shari’ah = Rites = Usual, diverse trends of a community. Minhaaj = A traced-out way = A set of laws]
5:49 So judge between them by what God has revealed. And do not follow their vain desires. Beware of them, lest they divert you from some of what God has revealed to you. If they turn away from the truth, be assured that God has decided to chastise them for some of their crimes. A great many people drift away from the right path.