So your will is stronger than God's grace and stronger than God's desire to save you? Are you sure you are really not god ?:>)))
Did God know that Adam and Eve were going to sin before He made them?
From your viewpoint my will wasn't strong enough because he did win. :-)
We are destined to be sons and daughters of God. If your son or daughter decides to disobey you does that diminish your love toward her? Suppose your kid goes and plays in the road? What do you do? You love them and don't want them to get hurt so you discipline, you teach them that it's dangerous. You could even put a fence up to prevent her from going into the road. But ultimately what she needs to do is to submit her will to yours.
Did God know that Adam and Eve were going to sin before He made them?
Before he created them? Since God is outside of time, then yes. He absolutely knew, but there was nothing he could do to stop it since he had granted them free will.
A better question would be did God know Adam and Eve would sin before he created the universe and time itself?