For Christan's, Why is god against knowledge?

I am not christan but, I was wondering why god is against my knowledge. To my understanding, God did not want adam and even to eat the apple because, of the knowledge that was contained in the apple. Though, I do not understand why God wanted man to remain stupid and not have the knowledge that came with eating the apple. Also, why did eating the apple make man acquire original sin, because of this act? (other than because God said so, which seems like a dumb reason to me(