R’ Yaakov Emden, known as the Ya’avetz, wrote in Seder Olam Vezuta,
“It is therefore a habitual saying of mine (not as a hypocritical flatterer, God forbid, for I am of the faithful believers of Israel, and I know well that the remnant of Israel will not speak falsehood, nor will their mouths contain a deceitful tongue) that the Nazarene brought about a double kindness in the world. On the one hand, he strengthened the Torah of Moses majestically, as mentioned earlier, and not one of our Sages spoke out more emphatically concerning the immutability of the Torah. And on the other hand, he did much good for the Gentiles (provided they do not turn about his intent as they please, as some foolish ones have done because they did not fully understand the intent of the authors of the Gospels.”
R’ Jacob Emden
References
R’ Emden’s Views on Christianity and the Noachide Commandments
Rosh Pinah Project on R’ Yaakov Emden
Wikipedia on R’ Yaakov Emden
Chabad.org on R’ Yaakov Emden