On the offchance you're being serious it's a mix of cursive and normal writing.
It basically says that they decided to write the old fashioned way and they received the save the date but are saying they can't attend. They immediately say that they realized they weren't living their life for God to the fullest extent and that they are trying to do better. Then the whole bottom half of the the letter is more religious talk to say that they don't approve of the addressee marrying outside of the catholic church and that while they (claim to) understand they cannot support it and won't be attending.
Does this include using a sharpie to control a hurricane?