What is a Christian?

Coach, I knpw that you don’t think it matters what comes out of your mouth but I must tell you that some of the things that come out of your mouth in the last few weeks have been very distressing to me. You are a man of God and the words coming out of your mouth should edify and build up the body not cause one to cringe and be repulsed. I have had to stop listening regularly because the words coming out of your mouth were so offensive.
I am sending you to this page because it addresses this issue with verses from the Bible but please note that it is not a Christian website.
The people that are defending foul language in many cases are people who obviously do not confess Christ. I am sad that a man that I admire and whom I have seen as a leader for many years has not yet grown out of the juvenile use of bad language. It does not become one who walks in the word. I just had to get this off my chest because I know you are a man called by God and I desire to see you walking by faith and not by sight. https://answers.yahoo.com/question/index;_ylt=A0LEVi3XLFhaQMMAqNEPxQt.;_ylu=X3oDMTEybGpyazhvBGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjQ5ODFfMQRzZWMDc2M-?qid=20120628202852AAbvBRF