What does it mean to take the Lord's name in vain? It means associating yourself with Him without entering into and keeping covenant with Him according to the terms and conditions of His New Covenant made known through instruction by His living ambassadors called apostles.
Most who take the Lord's name in vain daily are also church going, Bible reading, Chris professing, morally confident people who are well respected in their communities.
Jesus spoke of some of these as recorded in the gospels:
Matthew 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Little children, keep yourselves from the idolatry of this world's wisdom.
Ask me how to keep your faith unspotted and perfect in Christ for there is no darkness in Him and all things are made clear by Him in His presence.