Regarding the sinfulness of swearing in Christianity, we have clear Biblical principles conveyed in contexts like Ephesians 4:29 and 2 Timothy 2:16. My understanding is that certain words in every language are considered profane based on longstanding morals and common decency. There are several reasons why people swear nonetheless, and it seems here it was done to express very strong emotion as well as elicit a more intense response from readers. A question to consider: Would you use the F word when praying to God? I am sinful and in no position to judge the OP or you, just wanted to say that praying and cussing don’t mix well.