Yes that's an interesting point you make boolifooli isn't it rather odd that people still insist any god will do? You'd think mentioning it 4 times out of 10 it'd be crystal clear by now!
However, although it's an interesting point, the 10 commandments I read say this:
1. You shall have no other gods before Me.
2. You shall not make idols.
3. You shall not take the name of the LORD your God in vain.
4. Remember the Sabbath day, to keep it holy.
5. Honor your father and your mother.
6. You shall not murder.
7. You shall not commit adultery.
8. You shall not steal.
9. You shall not bear false witness against your neighbor.
10. You shall not covet.
So it looks more like 2 are about worshipping God rather than 4. The 'name in vain' you could stretch to having some respect but definitely not worship, and the sabbath command is for our sake. I suspect God knew rest would be important for our physical and mental health, seeing as he made the human body. So commands 4-10 are a recipe for not only protecting our fellow humans, but also ourselves. Sounds pretty healthy to me all ways round 
Interestingly there is a train of thought that taking God's name in vain doesn't mean saying "Goddamnit" or the link: rather they think ™ means using Gods name for false prophesy. Terms such as: "God told me to tell you…I have a word from the Lord…God says that if you send in this much money, you will be blessed.” All of there as not only cringeworthy, but unbiblical, and damaging (who hasn't heard of people trying to hang onto false hopes of prosperity gospels or false cures for illness?), and this is what they say is taking God's name in vain. Another protection for each other then!