If you really did believe in the Flying Spaghetti Monster, and if it said that you would be cursed if you spoke anything untrue about it, you wouldn't speak anything untrue about it, would you? Unless you wanted to be willfully disobedient, I suppose...but then wouldn't the subsequent curse upon you be a testimony to the veracity of what you said?
"God's favorite color is purple. He told me. He also said that if I lie about anything He says, he'll strike me dead!"
*lightning bolt strikes man dead*
Logical conclusion: two truths are revealed:
1. God's favorite color is not purple (or God never said anything about colors at all)
2, God will strike dead anyone who tells lies about Him
SO, basically, Paul would've wanted to be cursed, according to you.
Well, again there's two possible explanations I put forward:
1) Possible mental illness: In this case he would have genuinely believed he was speaking the truth and was at no risk of a curse.
2) Willful fraud: In this particular case, various religious leaders have a long history of committing fraudulent acts in the face of self proclaimed curses or other punishments laid out in the holy book they are preaching. For example:
Jeremiah 14:14-16 Then the LORD said unto me, The prophets prophesy lies in my name: I sent them not, neither have I commanded them, neither spake unto them: they prophesy unto you a false vision and divination, and a thing of nought, and the deceit of their heart. Therefore thus saith the LORD concerning the prophets that prophesy in my name, and I sent them not, yet they say, Sword and famine shall not be in this land; By sword and famine shall those prophets be consumed. And the people to whom they prophesy shall be cast out in the streets of Jerusalem because of the famine and the sword; and they shall have none to bury them, them, their wives, nor their sons, nor their daughters: for I will pour their wickedness upon them.
Or for New Testament:
2 Peter 2:1 - But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them--bringing swift destruction on themselves.
So according to the bible,
any false prophet is cursed.
So, how do you explain Oral Roberts, who famously claimed that god told him he needed to raise 8 million dollars or he would be "called home". Or Benny Hinn, or Peter Popoff, or Jim Bakker, or Ted Haggard, or any other well known evangelists who have a history of telling us what god says, then wind up being completely wrong while being exposed as dishonest crooks in the process. They knew what they were saying was bogus, and they didn't care. They must have also known god supposedly would have been unhappy with them, and they still didn't care. Moral of the story is, some people who hold positions of power will exploit that power for their own good.
As the famous quote goes:
Religion is regarded by the common people as true, by the wise as false, and by rulers as useful.
- Seneca (Roman Philosopher and Statesman)