Fun Fact: Have ever wondered why we call profanities “curse words” or “swear words”. Curse? Swear? Who are we cursing and what exactly are we swearing? Oh yeah, profanity. What sacred thing are we profaning? To profane is to pollute a holy thing.
It is the name “God” people are talking about. If you use the name of a god you use some of that god’s power. So you call upon god to harm an enemy or to solemnize an oath “I swear to tell the whole truth nothing but the truth so help me God”.
According to the ten commandments to use God’s name in this way is expressly forbidden. This is taking the lords name in vain. In vain. The Hebrew word which was translated as “vain” is “empty”. If you use your Gods name in empty gestures such as boasts or curses you have committed a deadly sin. This sin is the profane.
This practice of “swearing an oath while invoking a God” is a North European pagan tradition which just changed “I swear by Odin’s beard” to “I swear to God Almighty” without skipping a beat.