Which is precisely why in order to learn the things of God, you have to go to God. He reveals Himself. We can find guidence in the scriptures and revelations of the past, but we must recieve our own revelations to truly know anything of God.
How do you know it is "proof" and not another spirit?
Do you know what question tells me? It tells me you don't know the Holy Spirit from another. Because those who have experienced the Holy Spirit can tell the difference?
I can test Mormonism by Moses because once you start believing in man becoming gods then your prophets are false. The word "gods" is plural and you should know full well that your religion teaches polytheism.
Deuteronomy 18:20 But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.