Using God's Name for Falsehood

You shall not use the name of Jehovah your God irreverently, nor use it to swear to a falsehood. You will not escape punishment if you do. -- Exodus 20:7, Living Bible

According to the Jewish Virtual Library's Article on The Name of God, the above referenced commandment "refers solely to oath-taking, and <it> is a prohibition against swearing by God's Name falsely or frivolously (the word normally translated as "in vain" literally means 'for falsehood.'" Hence, from the Jewish perspective, proclaiming a message in God's name is serious business.

In this connection, it is interesting to note that Herbert W Armstrong was in the habit of signing his letters "In Christ's Name," and by claiming that he was "Christ's apostle." In light of the fact that we now know that many of the things that he taught were falsehoods, what does that suggest to us about Armstrong's relationship to this commandment? What's more, what does that suggest to us about those who continue to perpetuate those falsehoods in Christ's name? And, finally, what does that suggest to us about those who have worked to underscore and correct those falsehoods? In other words, who is misusing God's name? and who is honoring it?