Not even Jehovah's Witnesses do everything the Bible says. THEY emphasize going door-to-door. The Bible doesn't say that is the mark of God's followers. It says that the group back then included that, plus if you read some thoughts on that emphasis alone, like Ray Franz's books, you will find that the Christians back then may have been meeting "in private homes" instead of going "door-to-door." The Bible indicates that Christians should preach the good news, and I see street corner shouters with their microphones or signs doing it more closely to the way it was done in the first century. But shouting the word on television or radio fulfills that requirement also.
Some will say that the requirements for Christians are streamlined because Jesus freed them from "the law." Well then, many do the following: