It is forbidden in Islam to believe without understanding beforehand. Qur'an rejects blind faith, yes, the Qur'an does admit that it is the truth, but the Qur'an challenges the reader to figure out why and how it is the truth.
A person who cannot answer those questions cannot affirm the Qur'an to be the truth. If you'd like to prove the Qur'an to be false, then provide evidence regarding it.