god's name

Hi All, IS KNOWING AND USING GOD'S NAME IMPORTANT? First off yes it is important as it is reflected in the third commandment *Exodus 20:7 and we are not to use it in vain but what does that mean? I just thought this was an interesting topic as I know people that believe God needs to be called...

18 Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost. 19 Then Joseph her husband, being a just man, and not willing to make her a public example, was minded to put her away...

A friend of mine sent me this short video. It talks about God's Old Testament name, but I don't read Hebrew. And there's a thing about the ?Shema? And Judaism but then the Trinity. I'm little confused...