Was Jesus circumcised and did he eat pork? I know Jesus was a Jew. Jews are circumcised and don't eat pork. Was Jesus circumcised and did he eat pork? 

If so, why are these two things not primary ingredients of Christianity? 
I thought, to be a good Christian you have to be like Jesus.
From Luke 2:21, we know that Jesus was circumcised, as it states there


  At the end of eight days, when he was circumcised, he was given the name Jesus...


But we also have Peter's teaching in Acts 10:28: 


  "You know yourselves that how unlawful it is for a Jew to associate with or to visit any one of another nation, But God has shown me that I should not call any man common or unclean".


As to whether Jesus ate pork, we have neither record, nor good reason to presume  that he did, but we don't really know for certain. 

We do however, have record of Peter's vision in Joppa (Acts 11:1-9) where, when Peter protested against the eating of unclean things that were on the sheet which was lowered from heaven, by stating that an unclean thing had never entered his mouth, that the voice from heaven rebuked Peter, saying "What God has cleansed you must not call common".

As to why circumcision and the refusal to eat pork in particular, and adherence to Jewish dietary laws in general are not "primary ingredients of Christianity," note that while it is true that the way to be a good Cristian is to be like Jesus, first note that in the teaching on salvation in Matthew 25 (vv 31 ff.), where the King is separating the sheep and the goats, the separation was on what they did for other people. What they ate or whether they still had a foreskin is not reported to have mattered much.

Furthermore, if these external characteristics were "primary ingredients of Christianity", and if to be a good Christian one had to be like Jesus, would it not necessarily follow that to be a good Christian one must become an itinerant, unemployed Jewish carpenter? Or a vertically challenged tax collector (Zacchaeus)? Or an unemployed fisherman (several of the apostles)?