Is Atticus mitchell a christian

yes

that person ^ could be right, but I don't know. I've read he was Jewish. Makes sense 'cause his resume lists him as Eastern European and Mitchell is NOT an Eastern European name. A lot of people's ancestors changed their names to hide being Jewish and Mitchell seems to be a common one amongst Eastern Europeans.

Or he could be half Eastern European and half Irish (Mitchell is originally an Irish name), but his resume doesn't say that.