Why did God create us(CHRISTIANS ONLY!!!!!)?

Do not get me wrong I am a Christian and believe in God. I know he is real because of how he works in my life and what he has done for me. I cannot fathom something though. If God is all knowing, which he is, he must have known that we would sin before he made us. If so then why make us in the first place. I cannot understand this. If he knew we would sin, and many of is would go to hell, why not create something that would not aim. I know about free will, bit why coulnt he have created something with free will that would not disobey him. I mean he knows what every combination of being could be and could eisily make this, so why make us? Anyway thanks in advance for the help.