I don't think Christianity was as all that innovative - generosity, charity, love thy neighbour, mercy were not invented by Christianity.
I was going to support that with quotes from Maimonides' Mishneh Torah about charity, mercy, generosity, loving they neighbour, etc, but then it occurred to me that Maimonides was 12th century CE so it could be argued that he borrowed it from Christianity!
However, he illustrates his words with quotations from the Bible about mercy, generosity, loving they neighbour, etc., and draws on the scriptures to state that god's laws were meant to bring 'mercy, peace and loving kindness' to the world*. Those strands must have existed in Judaism before Christianity came into existence, and the concept of 'god' in Judaism seems to me to be richer and deeper than just the touchy one who you had to fear because he smote a lot if you crossed him
*found the source at last! Mishneh Torah Bk3 Ch2 v3 [if they are called verses? I'm not sure what the correct terminology is].
edited to say: no offence meant to the god of the Old Testament!