The word profane comes from the Latin profanus which literally means from the temple. You would think that a word that means out of the temple would be a good word and mean something that is reverent toward the Sacred. But profane means that which is not sacred but is common or secular. To be profane is to treat the sacred as if it a common commodity and put the sacred to a wrong use.
Consider the letters YHWH for example. They are the Hebrew letters for Yahweh, whom we call God. However, the Jews considered the name so sacred that it was not even to be spoken, much less be used outside the temple. The name of God was even to be written sparingly. For example, take the Gospel of Matthew where the author changed Marks kingdom of God to the kingdom of Heaven.
Listen to what Jesus said at the 5th chapter of Matthew:
Dont make any vows! And even to say, By Heavens! is a sacred vow to God, for the heavens are Gods throne. And if you say By the earth! it is a sacred vow, for the earth is his footstool. And dont swear By Jerusalem! for Jerusalem is the capital of the great King. Dont even swear By my head! for you cant turn one hair black or white. Say just a simple Yes, I will or No, I wont. Your word is enough. To strengthen your promise with a vow shows that something is wrong.
While many of us think of profanity as cussing, the real profanity is to take religion out of the realm of the sacred and use it simply as another weapon in the arsenal of the rich and powerful.