If the quran is supposed to be the final revelation, why did god later reveal the gospel of the FSM?

Y, it's been shown. The Quran itself has been shown to be a pile of crap for decades. When you say you'll open-mindedly reject your religion, you're lying. If you were truly open minded about it, you wouldn't be a Muslim anymore. Skeptics annotated, atheist critiques of the Koran, scholars looking into Koran's history, all these things show that your religion is baloney. But you're too in love with that baloney to see the truth.