Romans 14

1 Accept the one whose faith is weak, without quarrelling over disputable matters.
It would be almost impossible for a Church to agree 100% on the same theology. Differences of opinion shouldn't go so far as to cause division nor should they be avoided, but rather accepted and handled maturely. 

13 Therefore let us stop passing judgment on one another. Instead, make up your mind not to put any stumbling block or obstacle in the way of a brother or sister.
Before the cut off, I'd say 80% of my friends lived out a strictly hedonistic lifestyle. I was spending my time with them for most of my adolescence so obviously I picked up some of their mannerisms. However, I don't thinking swearing is particularly a sin in itself but rather how we use those terms. But it does state in scripture that we are not to conform to the ways of the world. If I am to use unwholesome language it could discourage someone young in their faith, making them assume that I'm lukewarm or give a false impression of what Jesus expects from his followers. To sacrifice what I believe is freedom of expression is unimportant compared to the spiritual state of a fellow brother. We must build each other up.