That said, due to all of their derailed rules and rituals dealing with normal, everyday things — like butchering and burials and clothing and separating the sexes and etc. — even the non-fanatical ones are difficult to integrate because they want an extra this and an exception to that and it just never seems to end. Their religions come along with a lot of cultural baggage that Christianity doesn't have. That is why you can convert from orthodox Judaism or Islam to orthodox Christianity, and the most noticeable "external" difference is that you start going to religious services on a different day of the week. This goes back to the concept of circumcision of the heart, from St. Paul's letter to the Romans. [[book:: Bible | Romans 2:25-29 | DRB]]