"I believe God already knew that Job would not fall, that's why he invited Satan to try him."
God did not invite satan to try him ! It was already in satans mind to do so !
And Jehovah saith unto the Adversary, `Hast thou set thy heart against My servant Job because there is none like him in the land, a man perfect and upright, fearing God, and turning aside from evil? Job 1:8 (YLT)
Please don't accuse God of such evil, it is one place where the KJV is a little vague, but where in fact if you know the true meaning it is clear !
Hope this hasn't made things less clear !
Col 2:8 -10 Beware lest anyone cheat you through philosophy and empty deceit, according to the tradition of men, according to the basic principles of the world, and not according to Christ. For in Him dwells all the fullness of the Godhead bodily; and you are complete in Him, who is the head of all principality and power.