In the name of Allah most gracious most merciful
Dispute Not with the People of the Book Except with Means Better
Qur'an 29:45-49 Surah Al-Ankabut (The Spider)
Recite what is sent of the Book by inspiration to thee and establish Regular Prayer: for Prayer restrains from shameful and unjust deeds; and remembrance of Allah is the greatest (thing in life) without doubt. And Allah knows the (deeds) that ye do.
And dispute ye not with the People of the Book except with means better (than mere disputation) unless it be with those of them who inflict wrong (and injury): but say "We believe in the Revelation which has come down to us and in that which came down to you; Our Allah and your Allah is one; and it is to Him we bow (in Islam)."
And thus (it is) that We have sent down the Book to thee. So the People of the Book believe therein as also do some of these (pagan Arabs): and none but Unbelievers reject Our Signs.
And thou wast not (able) to recite a Book before this (Book came) nor art thou (able) to transcribe it with thy right hand: in that case indeed would the talkers of vanities have doubted.
Nay here are Signs self-evident in the hearts of those endowed with knowledge: and none but the unjust reject Our Signs.
We should not forget this verse when we argue with people of the book.
So I have also some questions for you and I will give answers as well.
This are from the current Bible - Instant death to Apostates :
Old testament :
Deuteronomy 13:6-9 "If your very own brother, or your son or daughter, or the wife you love, or your closest friend secretly entices you, saying: Let us go and worship other gods (gods that neither you nor your fathers have known, gods of the peoples around you, whether near or far, from one end of the land to the other, or gods of other religions), do not yield to him or listen to him. Show him no pity. Do not spare him or shield him. You must certainly put him to death. Your hand must be the first in putting him to death, and then the hands of all the people."
Deuteronomy 17:3-5 "And he should go and worship other gods and bow down to them or to the sun or the moon or all the army of the heavens, .....and you must stone such one with stones and such one must die."
2 Chronicles 15:13 "All who would not seek the LORD, the God of Israel, were to be put to death, whether small or great, man or woman."
In the new testament:
Matthew 15:1-9
1 Then some Pharisees and teachers of the law came to Jesus from Jerusalem and asked,
2 "Why do your disciples break the tradition of the elders? They don't wash their hands before they eat!"
3 Jesus replied, "And why do you break the command of God for the sake of your tradition?
4 For God said, 'Honor your father and mother' and 'Anyone who curses his father or mother must be put to death.'
5 But you say that if a man says to his father or mother, 'Whatever help you might otherwise have received from me is a gift devoted to God,'
6he is not to 'honor his father' with it. Thus you nullify the word of God for the sake of your tradition.
7You hypocrites! Isaiah was right when he prophesied about you:
8 " 'These people honor me with their lips, but their hearts are far from me.
9 They worship me in vain; their teachings are but rules taught by men.'"
"Do not think that I [Jesus] have come to abolish the Law (the Old Testament) or the Prophets; I have not come to abolish them but to fulfill them. I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke or a pen, will by any means disappear from the Law (the Old Testament) until everything is accomplished. (Matthew 5:17-18)"
"Then Jesus said to the crowds and to his disciples: 'The teachers of the law and the Pharisees sit in Moses' seat. So you must obey them and do everything they tell you. But do not do what they do, for they do not practice what they preach.' (Matthew 23:1-3)"
I believe many Christians do not know these verses.