There are some things that we can understand about G-d, even though most things are far beyond our comprehension. Torah is no less important than any wisdom or any profession. If you want to truly know and understand it then you must study it, which requires a significant devotion of time. Regarding free will, even though G-d knows the future does not mean it is determined. We know that G-d's existence is outside of time. Everything that occurs in the world except for free will is call hashpa'a mi'lamala lemata, influence from Above to below. G-d tells everyone and everything in creation what to do, but in the case of free will G-d must wait for us. It's separate from G-d, so the future is not set yet because it's dependent totally on us.