1. FALSEHOOD

In Abhodah Zarah (6a) it says:

"A Nazarene is one who follows the false teachings of that man who taught them to worship on the first day of the Sabbath."

2. HERESY

In the same book Abhodah Zar. (Ch.I, 17a Toseph) mention is made of the heresy of James. A little further on (27b) we learn that this James was none other than the disciple of Jesus:

"...James Sekhanites, one of the disciples of Jesus, of whom we spoke in chapter 1."

But James taught, not his own doctrine, but that of Jesus.

3. IMPOSSIBLE TO OBSERVE

The author of Nizzachon(31) argues as follows on this point:

"A written law of the Christians is: If a Jew strike you on one cheek, turn the other also to him and do not in any way return the blow.(32) And ch. VI, v. 27 says: Love your enemies; do good to them who hate you; bless them who curse you and pray for those who do you harm; unto him who strikes you on one cheek offer him the other. To him who takes away thy cloak do not forbid him to take thy coat also, etc. The same is found in Matthew ch. V, v.39. But I have never seen any Christian keep this law, nor did Jesus himself behave as he taught others to do. For we find in John ch XVIII, v22, that when someone struck him on the face, he did not turn the other cheek, but became angry on account of this one stroke and asked 'Why do you strike me'? Likewise in the Acts of the Apostles, ch.XXIII, v. 3, we read: that when the High Priest ordered them that stood by to strike him on the mouth, Paul did not turn the other cheek; he cursed him saying 'God shall smite thee thou whited wall, etc.' This is contrary to their beliefs and destroys the foundation upon which their religion rests, for they boast that the law of Jesus is easy to observe. If Paul himself, who may be called the Dispenser of Jesus, could not preserve the precept of Jesus, who among the others who believe in him can prove to me that he can do so?"

(31) cf. Wagens. Sota, p. 822
(32) A corruption of the text in Luke ch. VI, 29

The author, however, who had the Gospels and the Acts of the Apostles under his hand, could not have failed to understand in what sense Christ commanded his followers to turn the other cheek to him who would strike them, since in another place he commanded his followers to cut off a hand or an arm, and to pluck out an eye if these should scandalize them. No one who has had the least acquaintance with the Holy Scriptures ever thought that these commands should be taken literally . Only deep malice and ignorance of the times in which Jesus lived can explain why the Jews, even to this day, use these passages to detract from the teachings of Jesus Christ.(33)

(33) cf. K. Lippe, Der Talmudjude vor dem Katholisch-protestantisch orthdoxen Dreirichter-Kollegium, p. 16, 1884